diff --git a/src/UI/UI_button.cpp b/src/UI/UI_button.cpp
index 70a8d81..168bde9 100644
--- a/src/UI/UI_button.cpp
+++ b/src/UI/UI_button.cpp
@@ -7,7 +7,8 @@ UI_button::UI_button(std::string id, std::string text, Color fg_color, Color bg_
 }
 
 UI_button::UI_button(const json& j)
-    : UI_item(UI_BUTTON_TYPE)
+    : UI_item(UI_BUTTON_TYPE),
+    m_on_click(nullptr)
 {
     from_json(j);
 }
diff --git a/src/UI/UI_slider.cpp b/src/UI/UI_slider.cpp
index 5178301..fb748e7 100644
--- a/src/UI/UI_slider.cpp
+++ b/src/UI/UI_slider.cpp
@@ -7,7 +7,8 @@ UI_slider::UI_slider(std::string id, std::string text, Color fg_color, Color bg_
 }
 
 UI_slider::UI_slider(const json& j)
-: UI_item(UI_SLIDER_TYPE)
+: UI_item(UI_SLIDER_TYPE),
+m_on_change(nullptr)
 {
     from_json(j);
 }
diff --git a/src/UI/UI_textbox.cpp b/src/UI/UI_textbox.cpp
index 2285117..c981dc7 100644
--- a/src/UI/UI_textbox.cpp
+++ b/src/UI/UI_textbox.cpp
@@ -6,7 +6,8 @@ UI_textbox::UI_textbox(std::string id, std::string hint, Color fg_color, Color b
 }
 
 UI_textbox::UI_textbox(const json& j)
-    : UI_item(UI_TEXTBOX_TYPE)
+    : UI_item(UI_TEXTBOX_TYPE),
+    m_on_change(nullptr)
 {
     from_json(j);
 }