diff --git a/app/src/main/java/com/icecream/snorlax/module/Pokemons.java b/app/src/main/java/com/icecream/snorlax/module/Pokemons.java
index 0819dee..93e88e0 100644
--- a/app/src/main/java/com/icecream/snorlax/module/Pokemons.java
+++ b/app/src/main/java/com/icecream/snorlax/module/Pokemons.java
@@ -28,6 +28,7 @@
 
 import static POGOProtos.Data.Capture.CaptureProbabilityOuterClass.CaptureProbability;
 import static POGOProtos.Data.PokemonDataOuterClass.PokemonData;
+import static POGOProtos.Enums.PokemonIdOuterClass.PokemonId;
 import static POGOProtos.Enums.PokemonMoveOuterClass.PokemonMove;
 
 @Singleton
@@ -123,11 +124,20 @@ public final class Pokemons {
 		mNames = resources.getStringArray(R.array.pokemon);
 	}
 
-	public Pokemons.Data with(PokemonData pokemonData) {
+	public Pokemons.Data with(PokemonData pokemonData) throws NullPointerException, IllegalArgumentException {
+		if (pokemonData == null) {
+			throw new NullPointerException("PokemonData cannot be null");
+		}
+		if (pokemonData.getPokemonId().equals(PokemonId.MISSINGNO) || pokemonData.getPokemonId().equals(PokemonId.UNRECOGNIZED)) {
+			throw new IllegalArgumentException("Unrecognized Pokemon Id");
+		}
 		return new Data(pokemonData);
 	}
 
-	public Probability with(CaptureProbability captureProbability) {
+	public Probability with(CaptureProbability captureProbability) throws NullPointerException {
+		if (captureProbability == null) {
+			throw new NullPointerException("CaptureProbability cannot be null");
+		}
 		return new Probability(captureProbability);
 	}
 
@@ -135,7 +145,7 @@ public final class Probability {
 
 		private final CaptureProbability mCaptureProbability;
 
-		Probability(CaptureProbability captureProbability) {
+		private Probability(CaptureProbability captureProbability) {
 			mCaptureProbability = captureProbability;
 		}
 
@@ -172,7 +182,7 @@ public final class Data {
 
 		private final PokemonData mPokemonData;
 
-		Data(PokemonData pokemonData) {
+		private Data(PokemonData pokemonData) {
 			mPokemonData = pokemonData;
 		}
 
diff --git a/app/src/main/java/com/icecream/snorlax/module/feature/encounter/Encounter.java b/app/src/main/java/com/icecream/snorlax/module/feature/encounter/Encounter.java
index 42c70b0..ab9474a 100644
--- a/app/src/main/java/com/icecream/snorlax/module/feature/encounter/Encounter.java
+++ b/app/src/main/java/com/icecream/snorlax/module/feature/encounter/Encounter.java
@@ -107,7 +107,11 @@ private void onWildEncounter(ByteString bytes) {
 			onEncounter(response.getWildPokemon().getPokemonData(), response.getCaptureProbability());
 		}
 		catch (InvalidProtocolBufferException | NullPointerException e) {
-			Log.d("EncounterResponse failed: %s" + e.getMessage());
+			Log.d("EncounterResponse failed: %s", e.getMessage());
+			Log.e(e);
+		}
+		catch (IllegalArgumentException e) {
+			Log.d("Cannot process IncenseEncounterResponse: %s", e.getMessage());
 			Log.e(e);
 		}
 	}
@@ -118,7 +122,11 @@ private void onDiskEncounter(ByteString bytes) {
 			onEncounter(response.getPokemonData(), response.getCaptureProbability());
 		}
 		catch (InvalidProtocolBufferException | NullPointerException e) {
-			Log.d("DiskEncounterResponse failed: %s" + e.getMessage());
+			Log.d("DiskEncounterResponse failed: %s", e.getMessage());
+			Log.e(e);
+		}
+		catch (IllegalArgumentException e) {
+			Log.d("Cannot process IncenseEncounterResponse: %s", e.getMessage());
 			Log.e(e);
 		}
 	}
@@ -129,12 +137,16 @@ private void onIncenseEncounter(ByteString bytes) {
 			onEncounter(response.getPokemonData(), response.getCaptureProbability());
 		}
 		catch (InvalidProtocolBufferException | NullPointerException e) {
-			Log.d("IncenseEncounterResponse failed: %s" + e.getMessage());
+			Log.d("IncenseEncounterResponse failed: %s", e.getMessage());
+			Log.e(e);
+		}
+		catch (IllegalArgumentException e) {
+			Log.d("Cannot process IncenseEncounterResponse: %s", e.getMessage());
 			Log.e(e);
 		}
 	}
 
-	private void onEncounter(PokemonData pokemonData, CaptureProbability captureProbability) {
+	private void onEncounter(PokemonData pokemonData, CaptureProbability captureProbability) throws NullPointerException, IllegalArgumentException {
 		Pokemons.Data data = mPokemons.with(pokemonData);
 		Pokemons.Probability probability = mPokemons.with(captureProbability);
 
diff --git a/app/src/main/java/com/icecream/snorlax/module/feature/rename/Rename.java b/app/src/main/java/com/icecream/snorlax/module/feature/rename/Rename.java
index afb5567..bab2437 100644
--- a/app/src/main/java/com/icecream/snorlax/module/feature/rename/Rename.java
+++ b/app/src/main/java/com/icecream/snorlax/module/feature/rename/Rename.java
@@ -29,6 +29,7 @@
 import com.icecream.snorlax.module.feature.Feature;
 import com.icecream.snorlax.module.feature.mitm.MitmListener;
 import com.icecream.snorlax.module.feature.mitm.MitmProvider;
+import com.icecream.snorlax.module.util.Log;
 
 import static POGOProtos.Data.PokemonDataOuterClass.PokemonData;
 import static POGOProtos.Enums.PokemonIdOuterClass.PokemonId;
@@ -103,19 +104,28 @@ private ByteString processInventory(GetInventoryResponse response) {
 			if (data.getPokemonData().getPokemonId() != PokemonId.MISSINGNO) {
 				PokemonData.Builder pokemon = data.getPokemonData().toBuilder();
 
-				//if (Strings.isEmpty(pokemon.getNickname())) {
+				try {
 					pokemon.setNickname(processNickname(data.getPokemonData()));
-				//}
-				data.setPokemonData(pokemon);
+				}
+				catch (NullPointerException e) {
+					Log.d("processNickname failed: %s", e.getMessage());
+					Log.e(e);
+				}
+				catch (IllegalArgumentException e) {
+					Log.d("Cannot process processNickname: %s", e.getMessage());
+					Log.e(e);
+				}
+				finally {
+					data.setPokemonData(pokemon);
+				}
 			}
-
 			item.setInventoryItemData(data);
 			delta.setInventoryItems(i, item);
 		}
 		return inventory.setInventoryDelta(delta).build().toByteString();
 	}
 
-	private String processNickname(PokemonData pokemonData) {
+	private String processNickname(PokemonData pokemonData) throws NullPointerException, IllegalArgumentException {
 		Pokemons.Data data = mPokemons.with(pokemonData);
 
 		DecimalFormat ivFormatter = new DecimalFormat("000.0");