diff --git a/lib/gateway3.js b/lib/gateway3.js
index 7223896..1923dfe 100644
--- a/lib/gateway3.js
+++ b/lib/gateway3.js
@@ -309,10 +309,12 @@ class Gateway3 extends XiaomiDevice {
             })({debugOutput, msgReceivedStat});
 
             _devices.forEach(_device => {
-                _device.spec.forEach(([, , state], idx) => {
-                    if (excludedStates.includes(state.stateName))
-                        _device.spec[idx] = undefined;
-                });
+                if (_device.spec != undefined) {
+                    _device.spec.forEach(([, , state], idx) => {
+                        if (excludedStates.includes(state.stateName))
+                            _device.spec[idx] = undefined;
+                    });
+                }
             });
 
             /* Setup devices */