Fix T81214: Crash on Action constraint without action

A `NULL` pointer check was missing.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/anim_data.c b/source/blender/blenkernel/intern/anim_data.c
index eb2cdf585c4..e7c6e00a61f 100644
--- a/source/blender/blenkernel/intern/anim_data.c
+++ b/source/blender/blenkernel/intern/anim_data.c
@@ -239,6 +239,11 @@ bool BKE_animdata_action_ensure_idroot(const ID *owner, bAction *action)
 {
   const int idcode = GS(owner->name);
 
+  if (action == NULL) {
+    /* A NULL action is usable by any ID type. */
+    return true;
+  }
+
   if (action->idroot == 0) {
     /* First time this Action is assigned, lock it to this ID type. */
     action->idroot = idcode;