diff --git a/source/blender/editors/space_node/node_group.c b/source/blender/editors/space_node/node_group.c
index f460c68638f..10f9718f1b6 100644
--- a/source/blender/editors/space_node/node_group.c
+++ b/source/blender/editors/space_node/node_group.c
@@ -662,7 +662,7 @@ static bool node_group_make_test_selected(bNodeTree *ntree, bNode *gnode, const
 	/* check poll functions for selected nodes */
 	for (node = ntree->nodes.first; node; node = node->next) {
 		if (node_group_make_use_node(node, gnode)) {
-			if (!node->typeinfo->poll_instance(node, ngroup)) {
+			if (node->typeinfo->poll_instance && !node->typeinfo->poll_instance(node, ngroup)) {
 				BKE_reportf(reports, RPT_WARNING, "Can not add node '%s' in a group", node->name);
 				ok = false;
 				break;
diff --git a/source/blender/nodes/intern/node_common.c b/source/blender/nodes/intern/node_common.c
index 92789eef816..54ffd3cd01c 100644
--- a/source/blender/nodes/intern/node_common.c
+++ b/source/blender/nodes/intern/node_common.c
@@ -105,7 +105,7 @@ int nodeGroupPoll(bNodeTree *nodetree, bNodeTree *grouptree)
 		return 0;
 	
 	for (node=grouptree->nodes.first; node; node=node->next) {
-		if (!node->typeinfo->poll_instance(node, nodetree)) {
+		if (node->typeinfo->poll_instance && !node->typeinfo->poll_instance(node, nodetree)) {
 			valid = 0;
 			break;
 		}