1 files changed, 3 insertions, 4 deletions

diff --git a/html.c b/html.c
index 957b326..3a5d28d 100644
--- a/html.c
+++ b/html.c
@@ -45,7 +45,7 @@ void htmlf(const char *format, ...)
 void html_txt(char *txt)
 {
         char *t = txt;
-        while(*t){
+        while(t && *t){
                 int c = *t;
                 if (c=='<' || c=='>' || c=='&') {
                         *t = '\0';
@@ -68,7 +68,7 @@ void html_txt(char *txt)
 void html_ntxt(int len, char *txt)
 {
         char *t = txt;
-        while(*t && len--){
+        while(t && *t && len--){
                 int c = *t;
                 if (c=='<' || c=='>' || c=='&') {
                         *t = '\0';
@@ -97,7 +97,7 @@ void html_ntxt(int len, char *txt)
 void html_attr(char *txt)
 {
         char *t = txt;
-        while(*t){
+        while(t && *t){
                 int c = *t;
                 if (c=='<' || c=='>' || c=='\'') {
                         *t = '\0';
@@ -155,4 +155,3 @@ void html_filemode(unsigned short mode)
         html_fileperm(mode >> 3);
         html_fileperm(mode);
 }
-