diff --git a/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/NgsiLdToPostgreSQL.java b/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/NgsiLdToPostgreSQL.java
index 2e1200d..a3c6283 100755
--- a/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/NgsiLdToPostgreSQL.java
+++ b/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/NgsiLdToPostgreSQL.java
@@ -235,18 +235,18 @@ public class NgsiLdToPostgreSQL extends AbstractSessionFactoryProcessor {
                         final PreparedStatement stmt = enclosure.getCachedStatement(conn);
                         JdbcCommon.setParameters(stmt, flowFile.getAttributes());
                         try {
-                            getLogger().info("Gonna create schema {}", schemaName);
+                            getLogger().debug("Gonna create schema {}", schemaName);
                             conn.createStatement().execute(postgres.createSchema(schemaName));
-                            getLogger().info("Gonna create table {} with columns {}", tableName, updatedListOfTypedFields);
+                            getLogger().debug("Gonna create table {} with columns {}", tableName, updatedListOfTypedFields);
                             conn.createStatement().execute(postgres.createTable(schemaName, tableName, updatedListOfTypedFields));
                             ResultSet rs = conn.createStatement().executeQuery(postgres.checkColumnNames(tableName));
                             Map<String, POSTGRESQL_COLUMN_TYPES> newColumns = postgres.getNewColumns(rs, updatedListOfTypedFields);
-                            if (newColumns.size() > 0) {
-                                getLogger().info("Identified new columns to create: {}", newColumns);
+                            if (!newColumns.isEmpty()) {
+                                getLogger().debug("Identified new columns to create: {}", newColumns);
                                 conn.createStatement().execute(postgres.addColumns(schemaName, tableName, newColumns));
                             }
                         } catch (SQLException s) {
-                            getLogger().error(s.toString(), s);
+                            getLogger().error("Error when preparing schema: {}", s.toString(), s);
                         }
                         stmt.addBatch();
                     }, onFlowFileError(context, session, result))) {
@@ -255,7 +255,7 @@ public class NgsiLdToPostgreSQL extends AbstractSessionFactoryProcessor {
                     enclosure.addFlowFile(flowFile);
                 }
             } catch (Exception e) {
-                getLogger().error(e.toString(), e);
+                getLogger().error("Unexpected exception processing flow file: {}", e.toString(), e);
             }
         }
     };
diff --git a/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/PostgreSQLBackend.java b/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/PostgreSQLBackend.java
index 34d5c6c..ecfb4dd 100755
--- a/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/PostgreSQLBackend.java
+++ b/nifi-ngsild-postgresql-processors/src/main/java/egm/io/nifi/processors/ngsild/PostgreSQLBackend.java
@@ -401,7 +401,11 @@ public String insertQuery(
         List<String> valuesForInsert =
             this.getValuesForInsert(entity, listOfFields, creationTime, datasetIdPrefixToTruncate, exportSysAttrs, ignoreEmptyObservedAt, flattenObservations);
 
-        return "insert into " + schemaName + "." + tableName + " " + this.getFieldsForInsert(listOfFields.keySet()) + " values " + String.join(",", valuesForInsert) + ";";
+        if (valuesForInsert.isEmpty()) {
+            logger.warn("Unable to get values to insert for {}, returning fake statement", entity.entityId);
+            return "select 1;";
+        } else
+            return "insert into " + schemaName + "." + tableName + " " + this.getFieldsForInsert(listOfFields.keySet()) + " values " + String.join(",", valuesForInsert) + ";";
     }
 
     public String checkColumnNames(String tableName) {