diff --git a/dmp-backend/web/src/main/java/eu/eudat/logic/mapper/prefilling/PrefillingMapper.java b/dmp-backend/web/src/main/java/eu/eudat/logic/mapper/prefilling/PrefillingMapper.java
index 4c3a6653b..e8758d628 100644
--- a/dmp-backend/web/src/main/java/eu/eudat/logic/mapper/prefilling/PrefillingMapper.java
+++ b/dmp-backend/web/src/main/java/eu/eudat/logic/mapper/prefilling/PrefillingMapper.java
@@ -57,7 +57,17 @@ public class PrefillingMapper {
                     sourceValue = ((Map)sourceValue).get(sourceKey);
                 }
             }
-            setValue(prefillingMapping, mapper.writeValueAsString(sourceValue), datasetWizardModel, parentNode, properties, type, licenseManager);
+            try {
+                setValue(prefillingMapping, mapper.writeValueAsString(sourceValue), datasetWizardModel, parentNode, properties, type, licenseManager);
+            }
+            catch (Exception e) {
+                if (prefillingMapping.getSemanticTarget() != null && !prefillingMapping.getSemanticTarget().isEmpty()) {
+                    logger.warn("Couldn't map " + prefillingMapping.getSemanticTarget());
+                }
+                else if (prefillingMapping.getTarget() != null && !prefillingMapping.getTarget().isEmpty()) {
+                    logger.warn("Couldn't map " + prefillingMapping.getTarget());
+                }
+            }
         }
         for (PrefillingFixedMapping fixedMapping: prefillingGet.getFixedMappings()) {
             setValue(fixedMapping, fixedMapping.getValue(), datasetWizardModel, parentNode, properties, type, licenseManager);