diff --git a/src/vim9compile.c b/src/vim9compile.c
index 2c3dc70..3e9b42c 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -4014,6 +4014,13 @@
     int		ppconst_used = ppconst->pp_used;
     char_u	*next;
 
+    // Ignore all kinds of errors when not producing code.
+    if (cctx->ctx_skip == SKIP_YES)
+    {
+	skip_expr(arg);
+	return OK;
+    }
+
     // Evaluate the first expression.
     if (compile_expr2(arg, cctx, ppconst) == FAIL)
 	return FAIL;
@@ -6724,18 +6731,9 @@
 
 	p = skipwhite(p);
 
-	if (cctx.ctx_skip == SKIP_YES
-		&& ea.cmdidx != CMD_if
+	if (cctx.ctx_had_return
 		&& ea.cmdidx != CMD_elseif
 		&& ea.cmdidx != CMD_else
-		&& ea.cmdidx != CMD_endif)
-	{
-	    line = (char_u *)"";
-	    continue;
-	}
-
-	if (ea.cmdidx != CMD_elseif
-		&& ea.cmdidx != CMD_else
 		&& ea.cmdidx != CMD_endif
 		&& ea.cmdidx != CMD_endfor
 		&& ea.cmdidx != CMD_endwhile
@@ -6743,11 +6741,8 @@
 		&& ea.cmdidx != CMD_finally
 		&& ea.cmdidx != CMD_endtry)
 	{
-	    if (cctx.ctx_had_return)
-	    {
-		emsg(_(e_unreachable_code_after_return));
-		goto erret;
-	    }
+	    emsg(_(e_unreachable_code_after_return));
+	    goto erret;
 	}
 
 	switch (ea.cmdidx)
@@ -6845,7 +6840,7 @@
 		    if (compile_expr0(&p, &cctx) == FAIL)
 			goto erret;
 
-		    // drop the return value
+		    // drop the result
 		    generate_instr_drop(&cctx, ISN_DROP, 1);
 
 		    line = skipwhite(p);
@@ -6859,7 +6854,7 @@
 		    line = compile_mult_expr(p, ea.cmdidx, &cctx);
 		    break;
 
-	    // TODO: other commands with an expression argument
+	    // TODO: any other commands with an expression argument?
 
 	    case CMD_append:
 	    case CMD_change:
@@ -6870,8 +6865,14 @@
 		    goto erret;
 
 	    case CMD_SIZE:
-		    semsg(_(e_invalid_command_str), ea.cmd);
-		    goto erret;
+		    if (cctx.ctx_skip != SKIP_YES)
+		    {
+			semsg(_(e_invalid_command_str), ea.cmd);
+			goto erret;
+		    }
+		    // We don't check for a next command here.
+		    line = (char_u *)"";
+		    break;
 
 	    default:
 		    // Not recognized, execute with do_cmdline_cmd().