diff --git a/src/font.c b/src/font.c
index 0503ca6..1057b17 100644
--- a/src/font.c
+++ b/src/font.c
@@ -16,6 +16,8 @@ int initFont(TTF_Font **font, char *filename, int size) {
 
 int writeText(GLuint *_textTexId, TTF_Font *font, char *text, SDL_Color color) {
   glGenTextures(1, _textTexId);
+  assert(_textTexId);
+
   glBindTexture(GL_TEXTURE_2D, *_textTexId);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);