X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Fupdate_image.c;h=317cca8a51d6c10cd99321cf33a78227f298b913;hb=a9118f781cff42817b629eaebdaa9eb0a5126b85;hp=d7a289a3a0dd5f6ffe253e0b5c37b776b87ce63a;hpb=e8c3ca2d1d0cac3d64985b45a9f654d2029a7518;p=wimlib

diff --git a/src/update_image.c b/src/update_image.c
index d7a289a3..317cca8a 100644
--- a/src/update_image.c
+++ b/src/update_image.c
@@ -243,8 +243,10 @@ execute_add_command(WIMStruct *wim,
 		progress.scan.wim_target_path = wim_target_path;
 		progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &progress);
 	}
-	config->_prefix = fs_source_path;
-	config->_prefix_num_tchars = tstrlen(fs_source_path);
+	if (config) {
+		config->_prefix = fs_source_path;
+		config->_prefix_num_tchars = tstrlen(fs_source_path);
+	}
 
 	if (wim_target_path[0] == T('\0'))
 		add_flags |= WIMLIB_ADD_FLAG_ROOT;