diff --git a/src/O3DGlide3Renderer.m b/src/O3DGlide3Renderer.m
index 3e000a5..e23d3e6 100644
--- a/src/O3DGlide3Renderer.m
+++ b/src/O3DGlide3Renderer.m
@@ -108,15 +108,14 @@ refreshEnumToFloat(GrScreenRefresh_t refresh)
 	self = [super init];
 
 	@try {
-		long long deviceIndex = [[options objectForKey:
-		    O3DRendererDeviceIndex] longLongValue];
-		FxI32 numDevices;
-
 		grGlideInit();
 
+		FxI32 numDevices;
 		if (!grGet(GR_NUM_BOARDS, sizeof(numDevices), &numDevices))
 			@throw [OFInitializationFailedException exception];
 
+		long long deviceIndex = [[options objectForKey:
+		    O3DRendererDeviceIndex] longLongValue];
 		if (deviceIndex > numDevices)
 			@throw [OFInvalidArgumentException exception];
 
@@ -140,7 +139,6 @@ refreshEnumToFloat(GrScreenRefresh_t refresh)
     availableResolutions
 {
 	OFMutableSet *ret = [OFMutableSet set];
-	GrResolution *resolutions;
 	GrResolution query = {
 		.resolution = GR_QUERY_ANY,
 		.refresh = GR_QUERY_ANY,
@@ -149,23 +147,30 @@ refreshEnumToFloat(GrScreenRefresh_t refresh)
 	};
 	size_t size = grQueryResolutions(&query, NULL);
 
-	resolutions = OFAllocMemory(1, size);
+	GrResolution *resolutions = OFAllocMemory(1, size);
 	@try {
-		void *pool;
 		size = grQueryResolutions(&query, resolutions);
 
-		pool = objc_autoreleasePoolPush();
-
+		void *pool = objc_autoreleasePoolPush();
 		for (size_t i = 0; i < size / sizeof(*resolutions); i++) {
-			OFValue *resolution = [OFValue valueWithSize:
-			    resolutionToSize(resolutions[i].resolution)];
-			OFNumber *refresh = [OFNumber numberWithFloat:
-			    refreshEnumToFloat(resolutions[i].refresh)];
+			OFSize resolutionSize =
+			    resolutionToSize(resolutions[i].resolution);
+			float refreshFloat =
+			    refreshEnumToFloat(resolutions[i].refresh);
 
+			if (resolutionSize.width == 0 ||
+			    resolutionSize.height == 0)
+				continue;
+			if (refreshFloat == 0)
+				continue;
+
+			OFValue *resolution =
+			    [OFValue valueWithSize: resolutionSize];
+			OFNumber *refresh =
+			    [OFNumber numberWithFloat: refreshFloat];
 			[ret addObject: [OFPair pairWithFirstObject: resolution
 						       secondObject: refresh]];
 		}
-
 		objc_autoreleasePoolPop(pool);
 	} @finally {
 		OFFreeMemory(resolutions);