diff --git a/custom_components/fglair/config_flow.py b/custom_components/fglair/config_flow.py
index b923b16..fdf9d20 100644
--- a/custom_components/fglair/config_flow.py
+++ b/custom_components/fglair/config_flow.py
@@ -101,14 +101,29 @@ def _import_schema() -> vol.Schema:
     )
 
 
+def _spec_int(spec: dict[str, Any], key: str, default: int) -> int:
+    try:
+        return int(spec.get(key, default))
+    except (TypeError, ValueError):
+        return default
+
+
 def _preview_schema(data: dict[str, Any]) -> vol.Schema:
     template = Template[str(data.get(CONF_TEMPLATE, "A"))]
-    spec = (data.get(CONF_OVERRIDES) or {}).get(
-        Prop.ADJUST_TEMPERATURE.name.lower(), {}
+    overrides = data.get(CONF_OVERRIDES)
+    spec = (
+        overrides.get(Prop.ADJUST_TEMPERATURE.name.lower(), {})
+        if isinstance(overrides, dict)
+        else {}
     )
-    temp_min = int(spec.get("min", TEMP_MIN_TENTHS))
-    temp_max = int(spec.get("max", TEMP_MAX_TENTHS))
-    step = int(data.get(CONF_TEMP_STEP) or TEMP_STEP_TENTHS[template])
+    if not isinstance(spec, dict):
+        spec = {}
+    temp_min = _spec_int(spec, "min", TEMP_MIN_TENTHS)
+    temp_max = _spec_int(spec, "max", TEMP_MAX_TENTHS)
+    try:
+        step = int(data.get(CONF_TEMP_STEP) or TEMP_STEP_TENTHS[template])
+    except (TypeError, ValueError):
+        step = TEMP_STEP_TENTHS[template]
     return vol.Schema(
         {
             vol.Required(CONF_TEMPLATE, default=template.name): vol.In(
@@ -123,14 +138,14 @@ def _preview_schema(data: dict[str, Any]) -> vol.Schema:
             vol.Required(CONF_TEMP_STEP, default=step / 10): vol.All(
                 vol.Coerce(float), vol.Range(min=0.1, max=5.0)
             ),
-            vol.Required(CONF_TEMP_NUM, default=int(spec.get("num", 1))): vol.All(
-                int, vol.Range(min=1, max=1000)
-            ),
-            vol.Required(CONF_TEMP_DEN, default=int(spec.get("den", 1))): vol.All(
-                int, vol.Range(min=1, max=1000)
-            ),
             vol.Required(
-                CONF_TEMP_OFFSET, default=int(spec.get("offset", 0))
+                CONF_TEMP_NUM, default=_spec_int(spec, "num", 1)
+            ): vol.All(int, vol.Range(min=1, max=1000)),
+            vol.Required(
+                CONF_TEMP_DEN, default=_spec_int(spec, "den", 1)
+            ): vol.All(int, vol.Range(min=1, max=1000)),
+            vol.Required(
+                CONF_TEMP_OFFSET, default=_spec_int(spec, "offset", 0)
             ): vol.All(int, vol.Range(min=-1000, max=1000)),
         }
     )