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diff --git a/MagickCore/accelerate.c b/MagickCore/accelerate.c
index 8b2194e4f9f0f7a4f59d8c896c4c99025326415d..4e8a8c93a0ba06ed6aca2061ed995f1b2943a6bc 100644 (file)
--- a/MagickCore/accelerate.c
+++ b/MagickCore/accelerate.c
@@ -501,8 +501,8 @@ static ConvolveInfo *GetConvolveInfo(const Image *image,const char *name,
   /*
     Create OpenCL context.
   */
-  status=clGetPlatformIDs(0,NULL,&number_platforms);
-  if (status == CL_SUCCESS)
+  status=clGetPlatformIDs(0,(cl_platform_id *) NULL,&number_platforms);
+  if ((status == CL_SUCCESS) && (number_platforms > 0))
     status=clGetPlatformIDs(1,platforms,NULL);
   if (status != CL_SUCCESS)
     {