diff --git a/frontend/src/utils/form/navigate-away-prompt.js b/frontend/src/utils/form/navigate-away-prompt.js
index da900ba72..69c430853 100644
--- a/frontend/src/utils/form/navigate-away-prompt.js
+++ b/frontend/src/utils/form/navigate-away-prompt.js
@@ -107,7 +107,7 @@ export class NavigateAwayPrompt {
     // allow the event to happen if the form was not touched by the
     // user (i.e. if the current FormData is equal to the initial FormData)
     // or the unload event was initiated by a form submit
-    if (!formDataHasChanged || this.unloadDueToSubmit)
+    if (!formDataHasChanged || this.unloadDueToSubmit || this._parentModalIsClosed())
       return;
 
     // cancel the unload event. This is the standard to force the prompt to appear.
@@ -117,4 +117,13 @@ export class NavigateAwayPrompt {
     // for all non standard compliant browsers we return a truthy value to activate the prompt.
     return true;
   }
+
+  _parentModalIsClosed() {
+    const parentModal = this._element.closest('.modal');
+    if (!parentModal)
+      return false;
+
+    const modalClosed = !parentModal.classList.contains('modal--open');
+    return modalClosed;
+  }
 }
diff --git a/frontend/src/utils/modal/modal.js b/frontend/src/utils/modal/modal.js
index 8f013572f..6b8e28a17 100644
--- a/frontend/src/utils/modal/modal.js
+++ b/frontend/src/utils/modal/modal.js
@@ -72,16 +72,7 @@ export class Modal {
   }
 
   destroy() {
-    this._eventManager.cleanUp();
-    if (this._closerElement !== undefined)
-      this._closerElement.remove();
-    if(this._triggerElement !== undefined)
-      this._triggerElement.classList.remove(MODAL_TRIGGER_CLASS);
-    if(this._modalsWrapper !== undefined)
-      this._modalsWrapper.remove();
-    if(this._modalOverlay !== undefined)
-      this._modalOverlay.remove();
-    this._element.classList.remove(MODAL_INITIALIZED_CLASS, MODAL_CLASS);
+    throw new Error('Destroying modals is not possible.');
   }
 
   _ensureModalWrapper() {
@@ -164,7 +155,6 @@ export class Modal {
     this._modalsWrapper.classList.remove(MODALS_WRAPPER_OPEN_CLASS);
 
     document.removeEventListener('keyup', this._onKeyUp);
-    this._app.utilRegistry.destroyAll(this._element);
   };
 
   _fillModal(url) {