diff --git a/src/UI/UI_dial.cpp b/src/UI/UI_dial.cpp
index 106637d..e1ab129 100644
--- a/src/UI/UI_dial.cpp
+++ b/src/UI/UI_dial.cpp
@@ -30,9 +30,9 @@ void UI_dial::from_json(const json& j)
 {
     UI_item::from_json(j);
 
-    this->m_min = j["min"];
-    this->m_max = j["max"];
-    this->m_value = j["value"];
+    this->m_min = j.at("min");
+    this->m_max = j.at("max");
+    this->m_value = j.at("value");
 }
 
 json UI_dial::to_json() const
diff --git a/src/UI/UI_slider.cpp b/src/UI/UI_slider.cpp
index 87ed3a7..3f0f763 100644
--- a/src/UI/UI_slider.cpp
+++ b/src/UI/UI_slider.cpp
@@ -35,9 +35,9 @@ void UI_slider::from_json(const json& j)
 {
     UI_item::from_json(j);
 
-    this->m_min = j["min"];
-    this->m_max = j["max"];
-    this->m_value = j["value"];
+    this->m_min = j.at("min");
+    this->m_max = j.at("max");
+    this->m_value = j.at("value");
 }
 
 json UI_slider::to_json() const
diff --git a/src/UI/UI_textbox.cpp b/src/UI/UI_textbox.cpp
index 121ad14..b6376b3 100644
--- a/src/UI/UI_textbox.cpp
+++ b/src/UI/UI_textbox.cpp
@@ -24,7 +24,7 @@ std::string UI_textbox::hint() const
 void UI_textbox::from_json(const json& j)
 {
     UI_item::from_json(j);
-    m_hint = j["hint"];
+    m_hint = j.at("hint");
 }
 
 json UI_textbox::to_json() const
diff --git a/src/UI/UI_thermo.cpp b/src/UI/UI_thermo.cpp
index 507b67c..be3db8b 100644
--- a/src/UI/UI_thermo.cpp
+++ b/src/UI/UI_thermo.cpp
@@ -74,15 +74,14 @@ void UI_thermo::from_json(const json& j)
 {
     UI_item::from_json(j);
 
-    this->m_min = j["min"];
-    this->m_max = j["max"];
-    this->m_value = j["value"];
+    this->m_min = j.at("min");
+    this->m_max = j.at("max");
+    this->m_value = j.at("value");
     this->m_color_map.clear();
     for (auto& i : j["color_map"])
     {
-        double k = i["key"];
-        std::string c;
-        i["value"].get_to(c);
+        double k = i.at("key");
+        std::string c = i.at("value");
         this->m_color_map[k] = Color(c);
     }
 }