diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 59ac957..ae48a89 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -401,6 +401,13 @@
     # comment
   END
   CheckScriptFailure(lines, 'E1004: White space required before and after ''||'' at "||true"', 3)
+
+  lines =<< trim END
+      var x = false
+              || false
+              || a.b
+  END
+  CheckDefFailure(lines, 'E1001:', 3)
 enddef
 
 " test &&
diff --git a/src/version.c b/src/version.c
index 9d355c8..ba8362b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3165,
+/**/
     3164,
 /**/
     3163,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index d25183f..4763e95 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -5095,6 +5095,7 @@
 	while (p[0] == opchar && p[1] == opchar)
 	{
 	    long	start_lnum = SOURCING_LNUM;
+	    long	save_sourcing_lnum;
 	    int		start_ctx_lnum = cctx->ctx_lnum;
 	    int		save_lnum;
 
@@ -5116,6 +5117,7 @@
 	    generate_ppconst(cctx, ppconst);
 
 	    // Every part must evaluate to a bool.
+	    save_sourcing_lnum = SOURCING_LNUM;
 	    SOURCING_LNUM = start_lnum;
 	    save_lnum = cctx->ctx_lnum;
 	    cctx->ctx_lnum = start_ctx_lnum;
@@ -5138,6 +5140,7 @@
 				 ?  JUMP_IF_COND_TRUE : JUMP_IF_COND_FALSE, 0);
 
 	    // eval the next expression
+	    SOURCING_LNUM = save_sourcing_lnum;
 	    if (may_get_next_line_error(p + 2, arg, cctx) == FAIL)
 	    {
 		ga_clear(&end_ga);