call engine exit

src/EngineGLFW.cpp

@@ -550,7 +550,7 @@ namespace ofxImGui
 		{
 			glDeleteTextures(1, &g_FontTexture);
 			//JVC: This is causing an error
-			//ImGui::GetIO().Fonts->TexID = 0;
+			ImGui::GetIO().Fonts->TexID = 0;
 			g_FontTexture = 0;
 		}
 	}

src/Gui.cpp

@@ -49,7 +49,7 @@ namespace ofxImGui
 	//--------------------------------------------------------------
 	void Gui::exit()
 	{
-
+		engine.exit();
 		if (theme)
 		{
 			delete theme;