diff --git a/src/addons/mod/scorm/classes/data-model-12.ts b/src/addons/mod/scorm/classes/data-model-12.ts
index 3fb1609cd..7f7f48582 100644
--- a/src/addons/mod/scorm/classes/data-model-12.ts
+++ b/src/addons/mod/scorm/classes/data-model-12.ts
@@ -510,8 +510,9 @@ export class AddonModScormDataModel12 {
             // Load default values.
             for (const element in this.dataModel[scoId]) {
                 if (element.match(/\.n\./) === null) {
-                    if (this.dataModel[scoId][element].defaultvalue !== undefined) {
-                        this.currentUserData[scoId].userdata[element] = this.dataModel[scoId][element].defaultvalue!;
+                    const defaultValue = this.dataModel[scoId][element].defaultvalue;
+                    if (defaultValue !== undefined) {
+                        this.currentUserData[scoId].userdata[element] = defaultValue;
                     }
                 }
             }
@@ -519,8 +520,9 @@ export class AddonModScormDataModel12 {
             // Load initial user data for current SCO.
             for (const element in this.def[scoId]) {
                 if (element.match(/\.n\./) === null) {
-                    if (this.dataModel[scoId][element].defaultvalue !== undefined) {
-                        this.currentUserData[scoId].userdata[element] = this.dataModel[scoId][element].defaultvalue!;
+                    const defaultValue = this.dataModel[scoId][element].defaultvalue;
+                    if (defaultValue !== undefined) {
+                        this.currentUserData[scoId].userdata[element] = defaultValue;
                     } else if (this.defExtra[scoId][element] !== undefined) {
                         // Check in user data values.
                         this.currentUserData[scoId].userdata[element] = this.defExtra[scoId][element];
@@ -808,7 +810,7 @@ export class AddonModScormDataModel12 {
 
                 if (this.dataModel[this.scoId][elementModel] !== undefined) {
                     if (this.dataModel[this.scoId][elementModel].mod != 'r') {
-                        expression = new RegExp(this.dataModel[this.scoId][elementModel].format!);
+                        expression = new RegExp(this.dataModel[this.scoId][elementModel].format ?? '');
                         value = value + '';
 
                         const matches = value.match(expression);
diff --git a/src/addons/mod/scorm/pages/player/player.ts b/src/addons/mod/scorm/pages/player/player.ts
index cdf25d82b..8303adb5d 100644
--- a/src/addons/mod/scorm/pages/player/player.ts
+++ b/src/addons/mod/scorm/pages/player/player.ts
@@ -415,7 +415,7 @@ export class AddonModScormPlayerPage implements OnInit, OnDestroy {
                 this.scorm,
                 sco.id,
                 this.attempt,
-                this.userData!,
+                this.userData ?? {},
                 this.mode,
                 this.offline,
                 this.canSaveTracks,
diff --git a/src/addons/mod/scorm/services/handlers/prefetch.ts b/src/addons/mod/scorm/services/handlers/prefetch.ts
index c4ffb9112..b935d1f61 100644
--- a/src/addons/mod/scorm/services/handlers/prefetch.ts
+++ b/src/addons/mod/scorm/services/handlers/prefetch.ts
@@ -89,7 +89,7 @@ export class AddonModScormPrefetchHandlerService extends CoreCourseActivityPrefe
         ]);
 
         // Success, return the hash.
-        return scorm.sha1hash!;
+        return scorm.sha1hash ?? '';
     }
 
     /**
@@ -112,7 +112,7 @@ export class AddonModScormPrefetchHandlerService extends CoreCourseActivityPrefe
         const packageUrl = AddonModScorm.getPackageUrl(scorm);
 
         // Get the folder where the unzipped files will be.
-        const dirPath = await AddonModScorm.getScormFolder(scorm.moduleurl!);
+        const dirPath = await AddonModScorm.getScormFolder(scorm.moduleurl ?? '');
 
         // Notify that the download is starting.
         onProgress && onProgress({ message: 'core.downloading' });
@@ -282,7 +282,7 @@ export class AddonModScormPrefetchHandlerService extends CoreCourseActivityPrefe
         const scorm = await this.getScorm(module, courseId);
 
         // Get the folder where SCORM should be unzipped.
-        const path = await AddonModScorm.getScormFolder(scorm.moduleurl!);
+        const path = await AddonModScorm.getScormFolder(scorm.moduleurl ?? '');
 
         return CoreFile.getDirectorySize(path);
     }
@@ -388,7 +388,7 @@ export class AddonModScormPrefetchHandlerService extends CoreCourseActivityPrefe
         const scorm = await this.getScorm(module, courseId, siteId);
 
         // Get the folder where SCORM should be unzipped.
-        const path = await AddonModScorm.getScormFolder(scorm.moduleurl!);
+        const path = await AddonModScorm.getScormFolder(scorm.moduleurl ?? '');
 
         const promises: Promise<unknown>[] = [];
 
diff --git a/src/addons/mod/scorm/services/scorm-offline.ts b/src/addons/mod/scorm/services/scorm-offline.ts
index 9f9874486..a7a188102 100644
--- a/src/addons/mod/scorm/services/scorm-offline.ts
+++ b/src/addons/mod/scorm/services/scorm-offline.ts
@@ -484,7 +484,7 @@ export class AddonModScormOfflineProvider {
                 response[scoId] = {
                     scoid: scoId,
                     userdata: {
-                        userid: userId!,
+                        userid: userId ?? site.getUserId(),
                         scoid: scoId,
                         timemodified: 0,
                     },
@@ -492,7 +492,7 @@ export class AddonModScormOfflineProvider {
                 };
             }
 
-            response[scoId].userdata[entry.element] = entry.value!;
+            response[scoId].userdata[entry.element] = entry.value ?? '';
             if (entry.timemodified > Number(response[scoId].userdata.timemodified)) {
                 response[scoId].userdata.timemodified = entry.timemodified;
             }
diff --git a/src/addons/mod/scorm/services/scorm-sync.ts b/src/addons/mod/scorm/services/scorm-sync.ts
index 19d073614..f3100d10c 100644
--- a/src/addons/mod/scorm/services/scorm-sync.ts
+++ b/src/addons/mod/scorm/services/scorm-sync.ts
@@ -777,7 +777,7 @@ export class AddonModScormSyncProvider extends CoreCourseActivitySyncBaseProvide
                         lastOffline,
                         newAttemptsSameOrder,
                         newAttemptsAtEnd,
-                        lastOfflineData.timecreated!,
+                        lastOfflineData.timecreated ?? 0,
                         lastOfflineData.incomplete,
                         warnings,
                         siteId,
@@ -812,7 +812,7 @@ export class AddonModScormSyncProvider extends CoreCourseActivitySyncBaseProvide
                         lastOffline,
                         newAttemptsSameOrder,
                         newAttemptsAtEnd,
-                        lastOfflineData.timecreated!,
+                        lastOfflineData.timecreated ?? 0,
                         lastOfflineData.incomplete,
                         warnings,
                         siteId,
diff --git a/src/addons/mod/scorm/services/scorm.ts b/src/addons/mod/scorm/services/scorm.ts
index 87c9fa072..756721a61 100644
--- a/src/addons/mod/scorm/services/scorm.ts
+++ b/src/addons/mod/scorm/services/scorm.ts
@@ -357,8 +357,8 @@ export class AddonModScormProvider {
                     element = '!';
                 } else if (reOther.test(element)) {
                     // Other symbols = | <> .
-                    matches = element.match(reOther)!;
-                    element = matches[1].trim();
+                    matches = element.match(reOther) ?? [];
+                    element = matches[1]?.trim();
 
                     if (trackData[element] !== undefined) {
                         let value = matches[3].trim().replace(/('|")/gi, '');
@@ -968,7 +968,7 @@ export class AddonModScormProvider {
             return launchUrl;
         }
 
-        const dirPath = await CoreFilepool.getPackageDirUrlByUrl(siteId, scorm.moduleurl!);
+        const dirPath = await CoreFilepool.getPackageDirUrlByUrl(siteId, scorm.moduleurl ?? '');
 
         return CoreText.concatenatePaths(dirPath, launchUrl);
     }
@@ -1573,7 +1573,7 @@ export class AddonModScormProvider {
         userData?: AddonModScormUserDataMap,
     ): boolean {
         if (offline) {
-            return AddonModScormOffline.saveTracksSync(scorm, scoId, attempt, tracks, userData!);
+            return AddonModScormOffline.saveTracksSync(scorm, scoId, attempt, tracks, userData ?? {});
         } else {
             const success = this.saveTracksSyncOnline(scoId, attempt, tracks);