diff --git a/charger/easee/log.go b/charger/easee/log.go
index 785631a34..f49967fb3 100644
--- a/charger/easee/log.go
+++ b/charger/easee/log.go
@@ -34,6 +34,10 @@ func (l *logger) Log(keyVals ...interface{}) error {
 		}
 
 		if i%2 == 0 {
+			if _, ok := v.(string); !ok {
+				panic(fmt.Sprintf("expected string, got %T from %+v", v, v))
+			}
+
 			if slices.Contains(skipped, v.(string)) {
 				skip = true
 				continue