diff --git a/assemble.js b/assemble.js
index 325823c..083c665 100644
--- a/assemble.js
+++ b/assemble.js
@@ -15,7 +15,7 @@ if (mode === "debug") {
   machineCode = assembler.assemble(inputFile_str, true);
   console.group("Machine code output");
   logMemory(machineCode);
-  console.groupEnd('Machine code output');
+  console.groupEnd();
 } else {
   machineCode = assembler.assemble(inputFile_str);
   console.log(machineCode); // TODO print just the numbers
diff --git a/assembler.js b/assembler.js
index 35895b6..72a8c78 100644
--- a/assembler.js
+++ b/assembler.js
@@ -204,5 +204,5 @@ function hex2num(hex) { return parseInt(hex, 16) };
 // Debug helpers
 const dbg = (lvl, s) => { if (DEBUG && (lvl >= DEBUG_LEVEL)) console.log(s) };
 const dbgGroup = (lvl, s) => { if (DEBUG && (lvl >= DEBUG_LEVEL)) console.group(s) };
-const dbgGroupEnd = (lvl, s) => { if (DEBUG && (lvl >= DEBUG_LEVEL)) console.groupEnd(s) };
+const dbgGroupEnd = (lvl, s) => { if (DEBUG && (lvl >= DEBUG_LEVEL)) console.groupEnd() };
 const dbgExec = (lvl, func) => { if (DEBUG && (lvl >= DEBUG_LEVEL)) func(); }
\ No newline at end of file
diff --git a/simulator.js b/simulator.js
index cc41257..97db98a 100644
--- a/simulator.js
+++ b/simulator.js
@@ -217,5 +217,5 @@ async function logCPUState(debug = false) {
     console.log();
     // Pause to show animated display:
     if (!debug) await new Promise(resolve => setTimeout(resolve, 75));
-  console.groupEnd('Step');
+  console.groupEnd();
 };
\ No newline at end of file