diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f2e029da..9304c1bbb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
 - Add `gpu_wait_cb` to wait until the GPU is working. It allows to run CPU a wait only when the rendered data is needed.
 
 ### Bugfixes
+- Fix `lv_obj_del` and `lv_obj_clean` if the children list changed during deletion.
 
 
 ## v7.4.0 (01.09.2020)
diff --git a/lv_conf_template.h b/lv_conf_template.h
index d4d419a6c..1cf09a9d8 100644
--- a/lv_conf_template.h
+++ b/lv_conf_template.h
@@ -653,7 +653,7 @@ typedef void * lv_obj_user_data_t;
  * 1: Some extra precision
  * 2: Best precision
  */
-#  define LV_LINEMETER_PRECISE    0
+#  define LV_LINEMETER_PRECISE    1
 #endif
 
 /*Mask (dependencies: -)*/
diff --git a/src/lv_core/lv_obj.c b/src/lv_core/lv_obj.c
index 30c5f6c6c..25fec838a 100644
--- a/src/lv_core/lv_obj.c
+++ b/src/lv_core/lv_obj.c
@@ -487,11 +487,8 @@ void lv_obj_clean(lv_obj_t * obj)
     lv_obj_t * child = lv_obj_get_child(obj, NULL);
     lv_obj_t * child_next;
     while(child) {
-        /* Read the next child before deleting the current
-         * because the next couldn't be read from a deleted (invalid) node*/
-        child_next = lv_obj_get_child(obj, child);
         lv_obj_del(child);
-        child = child_next;
+        child = lv_obj_get_child(obj, NULL);    /*Get the new first child*/
     }
 }
 
@@ -3709,17 +3706,13 @@ static void obj_del_core(lv_obj_t * obj)
 
     /*Recursively delete the children*/
     lv_obj_t * i;
-    lv_obj_t * i_next;
     i = _lv_ll_get_head(&(obj->child_ll));
     while(i != NULL) {
-        /*Get the next object before delete this*/
-        i_next = _lv_ll_get_next(&(obj->child_ll), i);
-
-        /*Call the recursive del to the child too*/
+        /*Call the recursive delete to the child too*/
         obj_del_core(i);
 
-        /*Set i to the next node*/
-        i = i_next;
+        /*Set i to the new head node*/
+        i = _lv_ll_get_head(&(obj->child_ll));
     }
 
     lv_event_mark_deleted(obj);
diff --git a/src/lv_widgets/lv_linemeter.c b/src/lv_widgets/lv_linemeter.c
index cd7f291c0..a8c9d3db8 100644
--- a/src/lv_widgets/lv_linemeter.c
+++ b/src/lv_widgets/lv_linemeter.c
@@ -76,6 +76,7 @@ lv_obj_t * lv_linemeter_create(lv_obj_t * par, const lv_obj_t * copy)
     ext->line_cnt    = 18;
     ext->scale_angle = 240;
     ext->angle_ofs = 0;
+    ext->mirrored = 0;
 
     /*The signal and design functions are not copied so set them here*/
     lv_obj_set_signal_cb(linemeter, lv_linemeter_signal);