trying some shader stuff, but segfaults

lib/nodes/load_image.h

@@ -1,6 +1,6 @@
-
-#include "../ImNodeFlow.h"
+#include <cstdint>
 #include <cstdlib>
+#include <iostream>
 #include <iterator>
 #include <ostream>
 
@@ -20,12 +20,11 @@
 #endif
 #endif
 
+#include "../ImNodeFlow.h"
 #include "../image_model.h"
 #include "../imfilebrowser.h"
 #include "../stb_image.h"
 #include "../uuid.h"
-#include <cstdint>
-#include <iostream>
 
 #ifdef __EMSCRIPTEN__
 #include "../emscripten_browser_file.h"
@@ -54,7 +53,11 @@ public:
     });
   }
 
-  ~Exposure() { stbi_image_free(returnBundle.image); }
+  ~Exposure() {
+    if (returnBundle.loaded) {
+      stbi_image_free(returnBundle.image);
+    }
+  }
 
   void draw() override {
     ImGui::SetNextItemWidth(100);
@@ -158,7 +161,11 @@ public:
     });
   }
 
-  ~Contrast() { stbi_image_free(returnBundle.image); }
+  ~Contrast() {
+    if (returnBundle.loaded) {
+      stbi_image_free(returnBundle.image);
+    }
+  }
 
   void draw() override {
     ImGui::SetNextItemWidth(100);
@@ -263,7 +270,11 @@ public:
     });
   }
 
-  ~SimpleBrightness() { stbi_image_free(returnBundle.image); }
+  ~SimpleBrightness() {
+    if (returnBundle.loaded) {
+      stbi_image_free(returnBundle.image);
+    }
+  }
 
   void draw() override {
     ImGui::SetNextItemWidth(100);