diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 36547dd..d37d9dd 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2222,8 +2222,11 @@
 			*i = val;
 		} else {
 			val = convdiv * (*i) / convmul;
-			if (!first)
+			if (!first) {
 				err = proc_put_char(&buffer, &left, '\t');
+				if (err)
+					break;
+			}
 			err = proc_put_long(&buffer, &left, val, false);
 			if (err)
 				break;