diff --git a/metarParser-entities/src/main/java/io/github/mivek/model/trend/AbstractTrend.java b/metarParser-entities/src/main/java/io/github/mivek/model/trend/AbstractTrend.java
index 01320a6f..8502d4df 100644
--- a/metarParser-entities/src/main/java/io/github/mivek/model/trend/AbstractTrend.java
+++ b/metarParser-entities/src/main/java/io/github/mivek/model/trend/AbstractTrend.java
@@ -3,6 +3,7 @@
 import io.github.mivek.enums.WeatherChangeType;
 import io.github.mivek.model.AbstractWeatherContainer;
 import java.util.Locale;
+import java.util.Objects;
 import org.apache.commons.lang3.builder.ToStringBuilder;
 
 /**
@@ -21,7 +22,7 @@ public abstract class AbstractTrend extends AbstractWeatherContainer {
      */
     protected AbstractTrend(final WeatherChangeType type) {
         super();
-        this.type = type;
+        this.type = Objects.requireNonNull(type);
     }
 
     /**
diff --git a/spotbugs.xml b/spotbugs.xml
index 3f4367a9..4e719382 100644
--- a/spotbugs.xml
+++ b/spotbugs.xml
@@ -16,4 +16,16 @@
     <Match>
         <Bug code="EI2"/>
     </Match>
+    <Match>
+        <Class name="io.github.mivek.parser.AbstractWeatherContainerParser"/>
+        <Bug code="CT"/>
+    </Match>
+    <Match>
+        <Class name="io.github.mivek.parser.AbstractWeatherCodeParser"/>
+        <Bug code="CT"/>
+    </Match>
+    <Match>
+        <Class name="io.github.mivek.model.trend.AbstractTrend"/>
+        <Bug code="CT"/>
+    </Match>
 </FindBugsFilter>