diff --git a/assets/disk0/tbas/basic.js b/assets/disk0/tbas/basic.js
index 8cfc59b..0cb6507 100644
--- a/assets/disk0/tbas/basic.js
+++ b/assets/disk0/tbas/basic.js
@@ -3012,7 +3012,7 @@ if (exec_args !== undefined && exec_args[1] !== undefined) {
 	}
 	catch (e) {
 		serial.printerr(`${e}\n${e.stack || "Stack trace undefined"}`);
-		println(e);
+		println(`${e}`);
 	}
 }
 while (!tbasexit) {
@@ -3035,7 +3035,7 @@ while (!tbasexit) {
 			}
 			catch (e) {
 				serial.printerr(`${e}\n${e.stack || "Stack trace undefined"}`);
-				println(e);
+				println(`${e}`);
 			}
 		}
 		println(prompt);
diff --git a/assets/disk0/tvdos/TVDOS.SYS b/assets/disk0/tvdos/TVDOS.SYS
index 6da8ace..0541e12 100644
--- a/assets/disk0/tvdos/TVDOS.SYS
+++ b/assets/disk0/tvdos/TVDOS.SYS
@@ -162,7 +162,8 @@ let injectIntChk = (s, n) => {
     // primitive way of injecting a code; will replace a JS string that matches the regex...
     let k = s
         .replace(/while *\([^\n]+\) *{/, "$& "+n+"();")
-        .replace(/for *\([^\n]+\) *{/, "$& "+n+"();");
+        .replace(/for *\([^\n]+\) *{/, "$& "+n+"();")
+        .replace(/do *{/, "$& "+n+"();");
     //serial.println(k);
     return k;
 }