diff --git a/classes/profile_helper.php b/classes/profile_helper.php
index 8739f16..210521a 100644
--- a/classes/profile_helper.php
+++ b/classes/profile_helper.php
@@ -123,14 +123,14 @@ public static function get_min_duration_for_group_and_reason(string $group, int
      *
      * @param  int $reason the profile type or REASON_*
      * @param  bool $usecache whether or not to even bother with caching. This allows for a forceful cache update.
-     * @return float duration (as seconds) of the fastest profile for a given reason.
+     * @return float|null duration (as seconds) of the fastest profile for a given reason.
      */
-    public static function get_min_duration_for_reason(int $reason, bool $usecache = true): float {
+    public static function get_min_duration_for_reason(int $reason, bool $usecache = true): ?float {
         $quota = self::$quotas[$reason];
 
         $cachefield = 'profile_type_' . $reason . '_min_duration_s';
         $cache = \cache::make('tool_excimer', 'request_metadata');
-        $result = $cache->get(self::ALL_GROUP_CACHE_KEY) ?: array();
+        $result = $cache->get(self::ALL_GROUP_CACHE_KEY) ?: [];
 
         if (!$usecache || empty($result) || !isset($result[$cachefield])) {
             // Get and set cache.
@@ -145,9 +145,19 @@ public static function get_min_duration_for_reason(int $reason, bool $usecache =
                      WHERE $reasons != ?
                   ORDER BY duration DESC
                      ";
-            $resultset = $db->get_records_sql($sql, [
-                profile::REASON_NONE,
-            ], $quota - 1, 1); // Will fetch the Nth item based on the quota.
+
+            try {
+                $resultset = $db->get_records_sql(
+                    $sql,
+                    [profile::REASON_NONE],
+                    $quota - 1, // Will fetch the Nth item based on the quota.
+                    1
+                );
+            } catch (\dml_exception $e) {
+                debugging('tool_excimer: Failed to get min duration: '.$e->getMessage());
+                return null;
+            }
+
             // Cache the results in (avoids recalculation later).
             $newvalue = (end($resultset)->min_duration ?? 0.0);
             // Updates the cache value if the calculated value is different.