diff --git a/src/specificClass.js b/src/specificClass.js
index 54271e0..cdab3cb 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -76,6 +76,9 @@ class ValveGroupControl {
 
     registerOnChildEvents() {}
 
+    registerChild(child, positionVsParent) {
+    }
+
     isValidSourceForMode(source, mode) {
         const allowedSourcesSet = this.config.mode.allowedSources[mode] || [];
         this.logger.info(`Allowed sources for mode '${mode}': ${allowedSourcesSet}`);