Ensure DynamicColumn hash lookups never see NULL pointers

This cannot happen in these code locations, but for the purposes
of static checkers like Coverity scan (and for future proofing),
add two more guards on NULL hash table entry pointers.

1 files changed, 3 insertions, 2 deletions

diff --git a/Action.c b/Action.c
index 5d774587..6e804f68 100644
--- a/Action.c
+++ b/Action.c
@@ -174,8 +174,9 @@ static Htop_Reaction actionSetSortColumn(State* st) {
       char* name = NULL;
       if (fields[i] >= LAST_PROCESSFIELD) {
          DynamicColumn* column = Hashtable_get(dynamicColumns, fields[i]);
-         if (column)
-            name = xStrdup(column->caption ? column->caption : column->name);
+         if (column == NULL)
+            continue;
+         name = xStrdup(column->caption ? column->caption : column->name);
       } else {
          name = String_trim(Process_fields[fields[i]].name);
       }