diff --git a/src/main/java/org/gcube/informationsystem/serialization/ElementMapper.java b/src/main/java/org/gcube/informationsystem/serialization/ElementMapper.java
index b1cac55..b3f4f24 100644
--- a/src/main/java/org/gcube/informationsystem/serialization/ElementMapper.java
+++ b/src/main/java/org/gcube/informationsystem/serialization/ElementMapper.java
@@ -312,7 +312,11 @@ public abstract class ElementMapper {
 			}
 			JsonNode jsonNode = mapper.readTree(reader);
 			jsonNode = analizeTypes((ObjectNode) jsonNode);
-			return ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode));
+			try {
+				return ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode));
+			}catch (Throwable t) {
+				throw e;
+			}
 		}
 	}
 	
@@ -336,7 +340,11 @@ public abstract class ElementMapper {
 			}
 			JsonNode jsonNode = mapper.readTree(stream);
 			jsonNode = analizeTypes((ObjectNode) jsonNode);
-			return ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode));
+			try {
+				return ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode));
+			}catch (Throwable t) {
+				throw e;
+			}
 		}
 	}
 	
@@ -359,7 +367,11 @@ public abstract class ElementMapper {
 			}
 			JsonNode jsonNode = mapper.readTree(string);
 			jsonNode = analizeTypes((ObjectNode) jsonNode);
-			return ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode));
+			try {
+				return ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode));
+			}catch (Throwable t) {
+				throw e;
+			}
 		} 
 	}
 	
@@ -374,9 +386,13 @@ public abstract class ElementMapper {
 			}
 			List<El> ret = new ArrayList<>();
 			ArrayNode arrayNode = (ArrayNode) mapper.readTree(string);
-			for(JsonNode jsonNode : arrayNode) {
-				jsonNode = analizeTypes((ObjectNode) jsonNode);
-				ret.add(ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode)));
+			try {
+				for(JsonNode jsonNode : arrayNode) {
+					jsonNode = analizeTypes((ObjectNode) jsonNode);
+					ret.add(ElementMapper.unmarshal(clz, mapper.writeValueAsString(jsonNode)));
+				}
+			}catch (Throwable t) {
+				throw e;
 			}
 			return ret;
 		}
@@ -390,9 +406,13 @@ public abstract class ElementMapper {
 		} catch (InvalidTypeIdException e) {
 			List<El> ret = new ArrayList<>();
 			ArrayNode arrayNode = (ArrayNode) mapper.readTree(string);
-			for(JsonNode jsonNode : arrayNode) {
-				jsonNode = analizeTypes((ObjectNode) jsonNode);
-				ret.add((El) ElementMapper.unmarshal(Element.class, mapper.writeValueAsString(jsonNode)));
+			try {
+				for(JsonNode jsonNode : arrayNode) {
+					jsonNode = analizeTypes((ObjectNode) jsonNode);
+					ret.add((El) ElementMapper.unmarshal(Element.class, mapper.writeValueAsString(jsonNode)));
+				}
+			}catch (Throwable t) {
+				throw e;
 			}
 			return ret;
 		}