diff --git a/install-onlyoffice.sh b/install-onlyoffice.sh
index 69d935150..ab38d1593 100755
--- a/install-onlyoffice.sh
+++ b/install-onlyoffice.sh
@@ -98,7 +98,7 @@ main() {
                 rm -rf "$OO_DIR/v8/web-apps/apps/spreadsheeteditor/main/resources/help"
                 rm -rf "$OO_DIR/v8/web-apps/apps/common/main/resources/help/"
                 ;;
-            v9)  install_version v9 v9.2.0.119+5  1f1184fb04cf72a7eb2a49a9740074b5419486c79e1fd713e1f8c09b8594a826050ae941fed6ac6a96807ba73cc751d7c807bd7e6b73de9e4f8e74cd5ed04cfa ;;
+            v9)  install_version v9 v9.3.0.140+2  fedf1af4c3b061f6afadbc231cee7f06d15dd1a5e82db3c5f1e9739b7ddf5b5b38825f3ec3da5e92d7ed6ad1d944c11b9f83875cc5fb67bde4f9c9b1434579d8 ;;
             x2t) install_x2t v7.3+1 ab0c05b0e4c81071acea83f0c6a8e75f5870c360ec4abc4af09105dd9b52264af9711ec0b7020e87095193ac9b6e20305e446f2321a541f743626a598e5318c1 ;;
             *)
                 echo "Unknown version: $version"
diff --git a/www/common/onlyoffice/inner.js b/www/common/onlyoffice/inner.js
index 0829277ee..a6fcb61f4 100644
--- a/www/common/onlyoffice/inner.js
+++ b/www/common/onlyoffice/inner.js
@@ -102,7 +102,7 @@ define([
             hashes: {},
             ids: {},
             mediasSources: {},
-            version: privateData.ooForceVersion ? Number(privateData.ooForceVersion) : OOCurrentVersion.currentVersionNumber
+            version: privateData.ooForceVersion ? Number(privateData.ooForceVersion) : OOCurrentVersion.currentVersionNumber,
         };
         var oldHashes = {};
         var oldIds = {};
@@ -565,6 +565,7 @@ define([
                 isLockedModal.modal = UI.openCustomModal(isLockedModal.content);
             }
             myUniqueOOId = undefined;
+            myIndex = undefined;
             setMyId();
             
             if (APP.docEditor) { APP.docEditor.destroyEditor(); } // Kill the old editor
@@ -2206,6 +2207,11 @@ define([
                 }];
                 common.checkTrimHistory(channels);
             }
+
+            content.debug = content.debug ?? {};
+            content.debug.idCollision = content.debug.idCollision ?? false;
+            APP.onLocal();
+
             console.log("OO ready");
         };
 
@@ -2628,12 +2634,25 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
                 makeChannel();
                 return;
             }
+
+            const onCorruptionWarning = Util.once((id) => {
+                console.log('id collision in document', id);
+                if (content?.debug?.idCollision !== undefined // No feedback for old documents
+                    && content?.debug?.idCollision === false) { // Send feedback only once
+                    Feedback.send(`channel=${content.channel}&OFFICE_DOCUMENT_ID_COLLISION`, true);
+                    content.debug = content.debug ?? {};
+                    content.debug.idCollision = true;
+                    APP.onLocal();
+                }
+            });
+
             APP.docEditor.connectMockServer({
                 onMessage: fromOOHandler,
                 getParticipants: getParticipants,
                 onAuth: onAuth,
                 getImageURL: getImageURL,
                 getInitialChanges: getInitialChanges,
+                onCorruptionWarning: onCorruptionWarning,
             });
         };
 
@@ -2998,7 +3017,7 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
             pinImages();
         };
 
-        const loadCp = async function (cp, keepQueue) {
+        const loadCheckpoint = async function (cp, keepQueue) {
             if (!isLockedModal.modal) {
                 isLockedModal.modal = UI.openCustomModal(isLockedModal.content);
             }
@@ -3018,7 +3037,7 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
         var loadHistoryCp = function (cp, keepQueue) {
             APP.history = true;
             APP.stopHistory = false;
-            loadCp(cp, keepQueue);
+            loadCheckpoint(cp, keepQueue);
         };
 
         var loadTemplate = function (href, pw, parsed) {
@@ -3068,7 +3087,7 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
                 });
                 ooChannel.historyLastHash = ooChannel.lastHash;
                 ooChannel.currentIndex = ooChannel.cpIndex;
-                loadCp(lastCp, true);
+                loadCheckpoint(lastCp, true);
             });
         };
 
@@ -3239,7 +3258,7 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
                 };
                 var onCheckpoint = function (cp) {
                     // We want to load a checkpoint:
-                    loadCp(cp, true);
+                    loadCheckpoint(cp, true);
                 };
                 var onPatchBack = function (cp, msgs) {
                     APP.history = true;
@@ -3259,10 +3278,10 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
                         });
                         ooChannel.queue = msgsFormatted;
                         setTimeout(function () {
-                            loadCp(cp, true);
+                            loadCheckpoint(cp, true);
                         }, 200);
                     } else {
-                        loadCp(cp);
+                        loadCheckpoint(cp);
                     }
                 };
                 var docType = function() {
@@ -3283,7 +3302,7 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
                     // Fill the queue and then load the last CP
                     rtChannel.getHistory(function () {
                         var lastCp = getLastCp();
-                        loadCp(lastCp, true);
+                        loadCheckpoint(lastCp, true);
                     });
                 };
 
@@ -3341,7 +3360,7 @@ Uncaught TypeError: Cannot read property 'calculatedType' of null
                         onPatch: onPatch,
                         onPatchBack: onPatchBack,
                         docType: docType,
-                        loadCp: loadCp,
+                        loadCp: loadCheckpoint,
                         loadHistoryCp: loadHistoryCp, 
                         onCheckpoint: onCheckpoint,
                         onRevert: commit,