diff --git a/engine/joint/v4k.h b/engine/joint/v4k.h
index b0b1877..7d132b7 100644
--- a/engine/joint/v4k.h
+++ b/engine/joint/v4k.h
@@ -370122,10 +370122,10 @@ unsigned shader(const char *vs, const char *fs, const char *attribs, const char
 
 static inline
 char *shader_preprocess(const char *src, const char *defines) {
-    const char *glsl_version = va("#version %s", ifdef(ems, "300 es", "150"));
-
     if (!src) return NULL;
 
+    const char *glsl_version = va("#version %s", ifdef(ems, "300 es", "150"));
+
     // detect GLSL version if set
     if (src[0] == '#' && src[1] == 'v') {
         const char *end = strstri(src, "\n");
diff --git a/engine/split/v4k_render.c b/engine/split/v4k_render.c
index ad641b5..bef8e53 100644
--- a/engine/split/v4k_render.c
+++ b/engine/split/v4k_render.c
@@ -94,10 +94,10 @@ unsigned shader(const char *vs, const char *fs, const char *attribs, const char
 
 static inline
 char *shader_preprocess(const char *src, const char *defines) {
-    const char *glsl_version = va("#version %s", ifdef(ems, "300 es", "150"));
-
     if (!src) return NULL;
 
+    const char *glsl_version = va("#version %s", ifdef(ems, "300 es", "150"));
+
     // detect GLSL version if set
     if (src[0] == '#' && src[1] == 'v') {
         const char *end = strstri(src, "\n");
diff --git a/engine/v4k.c b/engine/v4k.c
index ecc4b35..48268c6 100644
--- a/engine/v4k.c
+++ b/engine/v4k.c
@@ -17268,10 +17268,10 @@ unsigned shader(const char *vs, const char *fs, const char *attribs, const char
 
 static inline
 char *shader_preprocess(const char *src, const char *defines) {
-    const char *glsl_version = va("#version %s", ifdef(ems, "300 es", "150"));
-
     if (!src) return NULL;
 
+    const char *glsl_version = va("#version %s", ifdef(ems, "300 es", "150"));
+
     // detect GLSL version if set
     if (src[0] == '#' && src[1] == 'v') {
         const char *end = strstri(src, "\n");