diff --git a/src/insets/InsetTabular.cpp b/src/insets/InsetTabular.cpp
index 1dc55dbeb0..77dcefa434 100644
--- a/src/insets/InsetTabular.cpp
+++ b/src/insets/InsetTabular.cpp
@@ -4159,10 +4159,16 @@ void InsetTabular::doDispatch(Cursor & cur, FuncRequest & cmd)
 		cur.bv().showDialog("tabular");
 		break;
 
-	case LFUN_INSET_MODIFY:
-		if (!tabularFeatures(cur, to_utf8(cmd.argument())))
+	case LFUN_INSET_MODIFY: {
+		string arg;
+		if (cmd.getArg(1) == "from-dialog")
+			arg = cmd.getArg(0) + to_utf8(cmd.argument().substr(19));
+		else
+			arg = to_utf8(cmd.argument());
+		if (!tabularFeatures(cur, arg))
 			cur.undispatched();
 		break;
+	}
 
 	// insert file functions
 	case LFUN_FILE_INSERT_PLAINTEXT_PARA:
diff --git a/status.20x b/status.20x
index b64c35854e..d5cfd3bb28 100644
--- a/status.20x
+++ b/status.20x
@@ -206,6 +206,8 @@ What's new
 
 - Show entire index entry in outliner (bug 7774).
 
+- Fix a warning when changing table settings via the dialog (bug 7755).
+
 
 * DOCUMENTATION AND LOCALIZATION