thats not the problem but we can make it less ambiguous anyway

src/LCDDisplay.cpp

@@ -146,5 +146,5 @@ char LCDDisplay::bar(uint8_t char_id, double value) {
     for (uint8_t i = 0; i < (1.0 - value) * 8; i++)
         b[i] = 0;
     this->setCustomChar(char_id, b);
-    return cc(char_id);
+    return this->cc(char_id);
 }