diff --git a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationEnumValueExtractor.java b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationEnumValueExtractor.java
index b286498..8560294 100644
--- a/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationEnumValueExtractor.java
+++ b/impl/core/src/main/java/br/gov/frameworkdemoiselle/internal/implementation/ConfigurationEnumValueExtractor.java
@@ -55,20 +55,25 @@ public class ConfigurationEnumValueExtractor implements ConfigurationValueExtrac
 	public Object getValue(String prefix, String key, Field field, Configuration configuration) throws Exception {
 		String value = configuration.getString(prefix + key);
 		
-		Object enums[] = field.getDeclaringClass().getEnumConstants();
-		
-		for (int i=0; i<enums.length; i++){
-			if (enums[i].getClass().getSimpleName().equalsIgnoreCase(value)){
-				return enums[i];
+		if (value!=null){
+			Object enums[] = field.getDeclaringClass().getEnumConstants();
+			
+			for (int i=0; i<enums.length; i++){
+				if (enums[i].getClass().getSimpleName().equalsIgnoreCase(value)){
+					return enums[i];
+				}
 			}
 		}
+		else{
+			return null;
+		}
 		
 		throw new ConversionException(getBundle().getString("configuration-not-conversion",value,field.getDeclaringClass().getCanonicalName()));
 	}
 
 	@Override
 	public boolean isSupported(Field field) {
-		return field.getDeclaringClass().isEnum();
+		return field.getType().isEnum();
 	}
 	
 	private ResourceBundle getBundle(){
--
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