diff --git a/src/classes/site.ts b/src/classes/site.ts
index 9776bac47..bd24fe482 100644
--- a/src/classes/site.ts
+++ b/src/classes/site.ts
@@ -185,6 +185,7 @@ export class CoreSite {
     protected cleanUnicode = false;
     protected lastAutoLogin = 0;
     protected offlineDisabled = false;
+    protected ongoingRequests: { [cacheId: string]: Promise<any> } = {};
 
     /**
      * Create a site.
@@ -571,7 +572,14 @@ export class CoreSite {
             return Promise.reject(this.utils.createFakeWSError('core.unicodenotsupportedcleanerror', true));
         }
 
-        return this.getFromCache(method, data, preSets, false, originalData).catch(() => {
+        const cacheId = this.getCacheId(method, data);
+
+        // Check for an ongoing identical request if we're not ignoring cache.
+        if (preSets.getFromCache && this.ongoingRequests[cacheId]) {
+            return this.ongoingRequests[cacheId];
+        }
+
+        const promise = this.getFromCache(method, data, preSets, false, originalData).catch(() => {
             // Do not pass those options to the core WS factory.
             return this.wsProvider.call(method, data, wsPreSets).then((response) => {
                 if (preSets.saveToCache) {
@@ -676,6 +684,17 @@ export class CoreSite {
 
             return response;
         });
+
+        this.ongoingRequests[cacheId] = promise;
+        // Clear ongoing request after setting the promise (just in case it's already resolved).
+        promise.finally(() => {
+           // Make sure we don't clear the promise of a newer request that ignores the cache.
+           if (this.ongoingRequests[cacheId] === promise) {
+               delete this.ongoingRequests[cacheId];
+           }
+        });
+
+        return promise;
     }
 
     /**
diff --git a/src/core/course/providers/log-helper.ts b/src/core/course/providers/log-helper.ts
index 02a9aa92b..9ec8ea25b 100644
--- a/src/core/course/providers/log-helper.ts
+++ b/src/core/course/providers/log-helper.ts
@@ -28,7 +28,7 @@ export class CoreCourseLogHelperProvider {
     // Variables for database.
     static ACTIVITY_LOG_TABLE = 'course_activity_log';
     protected siteSchema: CoreSiteSchema = {
-        name: 'CoreCourseOfflineProvider',
+        name: 'CoreCourseLogHelperProvider',
         version: 1,
         tables: [
             {
diff --git a/src/providers/ws.ts b/src/providers/ws.ts
index de16e3103..bc2cd80fc 100644
--- a/src/providers/ws.ts
+++ b/src/providers/ws.ts
@@ -193,19 +193,14 @@ export class CoreWSProvider {
         data.wstoken = preSets.wsToken;
         siteUrl = preSets.siteUrl + '/webservice/rest/server.php?moodlewsrestformat=json';
 
-        let promise = this.getPromiseHttp('post', preSets.siteUrl, data);
+        // There are some ongoing retry calls, wait for timeout.
+        if (this.retryCalls.length > 0) {
+            this.logger.warn('Calls locked, trying later...');
 
-        if (!promise) {
-            // There are some ongoing retry calls, wait for timeout.
-            if (this.retryCalls.length > 0) {
-                this.logger.warn('Calls locked, trying later...');
-                promise = this.addToRetryQueue(method, siteUrl, data, preSets);
-            } else {
-                promise = this.performPost(method, siteUrl, data, preSets);
-            }
+            return this.addToRetryQueue(method, siteUrl, data, preSets);
+        } else {
+            return this.performPost(method, siteUrl, data, preSets);
         }
-
-        return promise;
     }
 
     /**