Catch postgres exceptions

Fix #338

src/databases/Postgres.ts

@@ -55,6 +55,7 @@ export class Postgres implements IDatabase {
 
         Logger.debug(`prepare (postgres): type: ${type}, query: ${query}, params: ${params}`);
 
+        try {
             const queryResult = await this.pool.query({text: query, values: params});
 
             switch (type) {
@@ -72,6 +73,9 @@ export class Postgres implements IDatabase {
                     break;
                 }
             }
+        } catch (err) {
+            Logger.error(`prepare (postgres): ${err}`);
+        }
     }
 
     private async createDB() {