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-rw-r--r--combinable/combinable.php1
1 files changed, 1 insertions, 0 deletions
diff --git a/combinable/combinable.php b/combinable/combinable.php
index cbc06e7..650f49d 100644
--- a/combinable/combinable.php
+++ b/combinable/combinable.php
@@ -138,6 +138,7 @@ class qtype_combined_combinable_algebra extends qtype_combined_combinable_text_e
public function data_to_form($context, $fileoptions) {
$answers = array('answer' => array());
+ $variables = array('variable' => array(), 'varmin' => array(), 'varmax' => array());
if ($this->questionrec !== null) {
foreach ($this->questionrec->options->answers as $answer) {
$answers['answer'][] = $answer->answer;