diff --git a/engines/grim/gfx_opengl.cpp b/engines/grim/gfx_opengl.cpp
index 0b562bda57f..9a28d99f2f0 100644
--- a/engines/grim/gfx_opengl.cpp
+++ b/engines/grim/gfx_opengl.cpp
@@ -197,7 +197,7 @@ void GfxOpenGL::initExtensions() {
 #endif
 
 	const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
-	if (strstr(extensions, "ARB_fragment_program")) {
+	if (extensions && strstr(extensions, "ARB_fragment_program")) {
 		_useDepthShader = true;
 		_useDimShader = true;
 	}
diff --git a/graphics/opengl/context.cpp b/graphics/opengl/context.cpp
index 6e68297cea0..a8de06de197 100644
--- a/graphics/opengl/context.cpp
+++ b/graphics/opengl/context.cpp
@@ -131,6 +131,10 @@ void Context::initialize(ContextType contextType) {
 
 int Context::getGLSLVersion() const {
 	const char *glslVersionString = (const char *)glGetString(GL_SHADING_LANGUAGE_VERSION);
+	if (!glslVersionString) {
+		warning("Could not get GLSL version");
+		return 0;
+	}
 
 	const char *glslVersionFormat;
 	if (type == kContextGL) {