diff --git a/src/context.c b/src/context.c
index 4c866fa9..fd344cf1 100644
--- a/src/context.c
+++ b/src/context.c
@@ -46,6 +46,16 @@
 //
 GLFWbool _glfwIsValidContextConfig(const _GLFWctxconfig* ctxconfig)
 {
+    if (ctxconfig->share)
+    {
+        if (ctxconfig->client == GLFW_NO_API ||
+            ctxconfig->share->context.client == GLFW_NO_API)
+        {
+            _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
+            return GLFW_FALSE;
+        }
+    }
+
     if (ctxconfig->source != GLFW_NATIVE_CONTEXT_API &&
         ctxconfig->source != GLFW_EGL_CONTEXT_API &&
         ctxconfig->source != GLFW_OSMESA_CONTEXT_API)
diff --git a/src/window.c b/src/window.c
index afdc4fcb..44c2c241 100644
--- a/src/window.c
+++ b/src/window.c
@@ -182,16 +182,6 @@ GLFWAPI GLFWwindow* glfwCreateWindow(int width, int height,
     wndconfig.title   = title;
     ctxconfig.share   = (_GLFWwindow*) share;
 
-    if (ctxconfig.share)
-    {
-        if (ctxconfig.client == GLFW_NO_API ||
-            ctxconfig.share->context.client == GLFW_NO_API)
-        {
-            _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
-            return NULL;
-        }
-    }
-
     if (!_glfwIsValidContextConfig(&ctxconfig))
         return NULL;