diff --git a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/config/RuntimeTypeAdapterFactory.java b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/config/RuntimeTypeAdapterFactory.java
index 7c1a223..982b8df 100644
--- a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/config/RuntimeTypeAdapterFactory.java
+++ b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/config/RuntimeTypeAdapterFactory.java
@@ -202,7 +202,6 @@ public final class RuntimeTypeAdapterFactory<T> implements TypeAdapterFactory {
 
     private <R> void initMaps(
             Gson gson,
-            TypeToken<R> type,
             Map<String, TypeAdapter<?>> labelToDelegate,
             Map<Class<?>, TypeAdapter<?>> subtypeToDelegate) {
         for (Map.Entry<String, Class<?>> entry : labelToSubtype.entrySet()) {
@@ -243,7 +242,7 @@ public final class RuntimeTypeAdapterFactory<T> implements TypeAdapterFactory {
         final Map<Class<?>, TypeAdapter<?>> subtypeToDelegate =
                 new LinkedHashMap<>(labelToSubtype.size());
 
-        initMaps(gson, type, labelToDelegate, subtypeToDelegate);
+        initMaps(gson, labelToDelegate, subtypeToDelegate);
         final RuntimeTypeAdapterFactory<T> that = this;
 
         return new TypeAdapter<R>() {
diff --git a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/SecurityCamera.java b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/SecurityCamera.java
index c977130..218ba4a 100644
--- a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/SecurityCamera.java
+++ b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/SecurityCamera.java
@@ -17,7 +17,6 @@ public class SecurityCamera extends Switchable implements BooleanTriggerable {
     private boolean on;
 
     @Column(name = "video", nullable = false)
-    @NotNull
     private String path;
 
     public String getPath() {