diff -Naurp a/kernel/nvidia/nv-dma.c b/kernel/nvidia/nv-dma.c
--- a/kernel/nvidia/nv-dma.c	2019-05-08 01:37:30.000000000 +0000
+++ b/kernel/nvidia/nv-dma.c	2019-06-08 18:33:00.000000000 +0000
@@ -613,7 +613,7 @@ static NvBool nv_dma_is_map_resource_imp
 #endif
     }
 
-    return (ops->map_resource != NULL);
+    return (ops && ops->map_resource);
 #else
     return NV_FALSE;
 #endif