diff --git a/src/libpgagroal/configuration.c b/src/libpgagroal/configuration.c
index 950026e7..fa748c33 100644
--- a/src/libpgagroal/configuration.c
+++ b/src/libpgagroal/configuration.c
@@ -1496,6 +1496,12 @@ pgagroal_read_frontend_users_configuration(void* shm, char* filename)
 
          ptr = strtok(NULL, ":");
 
+         if (ptr == NULL)
+         {
+            status = PGAGROAL_CONFIGURATION_STATUS_CANNOT_DECRYPT;
+            goto error;
+         }
+
          if (pgagroal_base64_decode(ptr, strlen(ptr), &decoded, &decoded_length))
          {
             status = PGAGROAL_CONFIGURATION_STATUS_CANNOT_DECRYPT;
@@ -1637,6 +1643,12 @@ pgagroal_read_admins_configuration(void* shm, char* filename)
 
          ptr = strtok(NULL, ":");
 
+         if (ptr == NULL)
+         {
+            status = PGAGROAL_CONFIGURATION_STATUS_CANNOT_DECRYPT;
+            goto error;
+         }
+
          if (pgagroal_base64_decode(ptr, strlen(ptr), &decoded, &decoded_length))
          {
             status = PGAGROAL_CONFIGURATION_STATUS_CANNOT_DECRYPT;
@@ -1765,6 +1777,12 @@ pgagroal_read_superuser_configuration(void* shm, char* filename)
 
          ptr = strtok(NULL, ":");
 
+         if (ptr == NULL)
+         {
+            status = PGAGROAL_CONFIGURATION_STATUS_CANNOT_DECRYPT;
+            goto error;
+         }
+
          if (pgagroal_base64_decode(ptr, strlen(ptr), &decoded, &decoded_length))
          {
             status = PGAGROAL_CONFIGURATION_STATUS_CANNOT_DECRYPT;