diff --git a/code/espurna/sensor.cpp b/code/espurna/sensor.cpp
index e4525a74..e75d84f0 100644
--- a/code/espurna/sensor.cpp
+++ b/code/espurna/sensor.cpp
@@ -443,7 +443,7 @@ sensor::Energy _sensorParseEnergy(const String& value) {
 
     const char* plus { strchr(p, '+') };
     if (!plus) {
-        return;
+        return result;
     }
 
     p = plus + 1;