diff --git a/protocols/core.js b/protocols/core.js
index a21a331..9791970 100644
--- a/protocols/core.js
+++ b/protocols/core.js
@@ -39,7 +39,7 @@ class Core extends EventEmitter {
 
         let abortCall = null;
         this.abortedPromise = new Promise((resolve,reject) => {
-            abortCall = () => reject("Query is finished -- cancelling outstanding promises");
+            abortCall = () => reject(new Error("Query is finished -- cancelling outstanding promises"));
         });
 
         // Make sure that if this promise isn't attached to, it doesn't throw a unhandled promise rejection
diff --git a/protocols/nadeo.js b/protocols/nadeo.js
index 7b46788..55041b2 100644
--- a/protocols/nadeo.js
+++ b/protocols/nadeo.js
@@ -80,7 +80,7 @@ class Nadeo extends Core {
 
         const sentPromise = new Promise(async (resolve,reject) => {
             client.methodCall(cmd, params, (err, value) => {
-                if (err) reject('XMLRPC error ' + JSON.stringify(err));
+                if (err) reject(new Error('XMLRPC error ' + JSON.stringify(err)));
                 resolve(value);
             });
         });