diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b247ec9..3e907f68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -50,6 +50,8 @@
   that it is (much) slower compared to previous foot versions. Use the
   **scrollback.multiplier** option in `foot.ini` if you find the new
   speed too slow (https://codeberg.org/dnkl/foot/issues/144).
+* Crash when `foot.ini` contains an invalid section name
+  (https://codeberg.org/dnkl/foot/issues/159).
 
 
 ### Security
diff --git a/config.c b/config.c
index c69af59d..ff5d6c59 100644
--- a/config.c
+++ b/config.c
@@ -1673,6 +1673,11 @@ parse_config_file(FILE *f, struct config *conf, const char *path, bool errors_ar
             continue;
         }
 
+        if (section >= SECTION_COUNT) {
+            /* Last section name was invalid; ignore all keys in it */
+            continue;
+        }
+
         char *key = strtok(key_value, "=");
         if (key == NULL) {
             LOG_AND_NOTIFY_ERR("%s:%d: syntax error: no key specified", path, lineno);
@@ -1711,6 +1716,8 @@ parse_config_file(FILE *f, struct config *conf, const char *path, bool errors_ar
         LOG_DBG("section=%s, key='%s', value='%s', comment='%s'",
                 section_info[section].name, key, value, comment);
 
+        assert(section >= 0 && section < SECTION_COUNT);
+
         parser_fun_t section_parser = section_info[section].fun;
         assert(section_parser != NULL);