Fixes #1428

radio/src/mixer.cpp

@@ -245,8 +245,10 @@ int16_t applyLimits(uint8_t channel, int32_t value)
 
   if (lim->revert) ofs = -ofs; // finally do the reverse.
 
+#if defined(SAFETY_CHANNEL_FUNCTION)
   if (safetyCh[channel] != -128) // if safety channel available for channel check
     ofs = calc100toRESX(safetyCh[channel]);
+#endif
 
   return ofs;
 }