Add some multimesh null checks to avoid crash

drivers/gles3/storage/mesh_storage.h

@@ -535,21 +535,25 @@ public:
 
 	_FORCE_INLINE_ RS::MultimeshTransformFormat multimesh_get_transform_format(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, RS::MULTIMESH_TRANSFORM_3D);
 		return multimesh->xform_format;
 	}
 
 	_FORCE_INLINE_ bool multimesh_uses_colors(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, false);
 		return multimesh->uses_colors;
 	}
 
 	_FORCE_INLINE_ bool multimesh_uses_custom_data(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, false);
 		return multimesh->uses_custom_data;
 	}
 
 	_FORCE_INLINE_ uint32_t multimesh_get_instances_to_draw(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, 0);
 		if (multimesh->visible_instances >= 0) {
 			return multimesh->visible_instances;
 		}
@@ -558,21 +562,25 @@ public:
 
 	_FORCE_INLINE_ GLuint multimesh_get_gl_buffer(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, 0);
 		return multimesh->buffer;
 	}
 
 	_FORCE_INLINE_ uint32_t multimesh_get_stride(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, 0);
 		return multimesh->stride_cache;
 	}
 
 	_FORCE_INLINE_ uint32_t multimesh_get_color_offset(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, 0);
 		return multimesh->color_offset_cache;
 	}
 
 	_FORCE_INLINE_ uint32_t multimesh_get_custom_data_offset(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, 0);
 		return multimesh->custom_data_offset_cache;
 	}
 

servers/rendering/renderer_rd/storage_rd/mesh_storage.h

@@ -689,26 +689,31 @@ public:
 
 	_FORCE_INLINE_ bool multimesh_uses_indirect(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, false);
 		return multimesh->indirect;
 	}
 
 	_FORCE_INLINE_ RS::MultimeshTransformFormat multimesh_get_transform_format(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, RS::MULTIMESH_TRANSFORM_3D);
 		return multimesh->xform_format;
 	}
 
 	_FORCE_INLINE_ bool multimesh_uses_colors(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, false);
 		return multimesh->uses_colors;
 	}
 
 	_FORCE_INLINE_ bool multimesh_uses_custom_data(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, false);
 		return multimesh->uses_custom_data;
 	}
 
 	_FORCE_INLINE_ uint32_t multimesh_get_instances_to_draw(RID p_multimesh) const {
 		MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
+		ERR_FAIL_NULL_V(multimesh, 0);
 		if (multimesh->visible_instances >= 0) {
 			return multimesh->visible_instances;
 		}