diff --git a/code/renderergl1/tr_bsp.c b/code/renderergl1/tr_bsp.c
index ff623ad9..1e660f28 100644
--- a/code/renderergl1/tr_bsp.c
+++ b/code/renderergl1/tr_bsp.c
@@ -1070,7 +1070,7 @@ int R_StitchPatches( int grid1num, int grid2num ) {
 			}
 			for (m = 0; m < 2; m++) {
 
-				if (grid2->height >= MAX_GRID_SIZE)
+				if (!grid2 || grid2->height >= MAX_GRID_SIZE)
 					break;
 				if (m) offset2 = grid2->width-1;
 				else offset2 = 0;
diff --git a/code/renderergl1/tr_model_iqm.c b/code/renderergl1/tr_model_iqm.c
index 0f99f160..6c47ed07 100644
--- a/code/renderergl1/tr_model_iqm.c
+++ b/code/renderergl1/tr_model_iqm.c
@@ -144,7 +144,7 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 	unsigned short		*framedata;
 	char			*str;
 	int			i, j;
-	float			jointInvMats[IQM_MAX_JOINTS * 12];
+	float			jointInvMats[IQM_MAX_JOINTS * 12] = {0.0f};
 	float			*mat, *matInv;
 	size_t			size, joint_names;
 	iqmData_t		*iqmData;
diff --git a/code/renderergl1/tr_shade_calc.c b/code/renderergl1/tr_shade_calc.c
index e8f43e4f..ae33c7fb 100644
--- a/code/renderergl1/tr_shade_calc.c
+++ b/code/renderergl1/tr_shade_calc.c
@@ -771,7 +771,7 @@ void RB_CalcModulateAlphasByFog( unsigned char *colors ) {
 */
 void RB_CalcModulateRGBAsByFog( unsigned char *colors ) {
 	int		i;
-	float	texCoords[SHADER_MAX_VERTEXES][2];
+	float	texCoords[SHADER_MAX_VERTEXES][2] = {{0.0f}};
 
 	// calculate texcoords so we can derive density
 	// this is not wasted, because it would only have