matplotlib
diff --git a/‎src/_macosx.m
Copy file name to clipboardExpand all lines: src/_macosx.m
+11-9Lines changed: 11 additions & 9 deletions b/‎src/_macosx.m
Copy file name to clipboardExpand all lines: src/_macosx.m
+11-9Lines changed: 11 additions & 9 deletions
@@ -1751,6 +1751,15 @@ - (void)flagsChanged:(NSEvent *)event
                                (void*) self, (void*)(self->timer));
 }
 
+static void
+Timer__timer_stop_impl(Timer* self)
+{
+    if (self->timer) {
+        [self->timer invalidate];
+        self->timer = NULL;
+    }
+}
+
 static PyObject*
 Timer__timer_start(Timer* self, PyObject* args)
 {
@@ -1769,6 +1778,8 @@ - (void)flagsChanged:(NSEvent *)event
         goto exit;
     }
 
+    // Stop the current timer if it is already running
+    Timer__timer_stop_impl(self);
     // hold a reference to the timer so we can invalidate/stop it later
     self->timer = [NSTimer scheduledTimerWithTimeInterval: interval
                                                   repeats: !single
@@ -1794,15 +1805,6 @@ - (void)flagsChanged:(NSEvent *)event
     }
 }
 
-static void
-Timer__timer_stop_impl(Timer* self)
-{
-    if (self->timer) {
-        [self->timer invalidate];
-        self->timer = NULL;
-    }
-}
-
 static PyObject*
 Timer__timer_stop(Timer* self)
 {