diff --git a/src/Optimizely/Event/Builder/EventBuilder.php b/src/Optimizely/Event/Builder/EventBuilder.php
index 39ef68ab..744d2cf1 100644
--- a/src/Optimizely/Event/Builder/EventBuilder.php
+++ b/src/Optimizely/Event/Builder/EventBuilder.php
@@ -150,19 +150,26 @@ private function getCommonParams($config, $userId, $attributes)
*/
private function getImpressionParams(Experiment $experiment, $variation, $flagKey, $ruleKey, $ruleType, $enabled)
{
- $variationKey = $variation->getKey() ? $variation->getKey() : '';
+ $variationKey = '';
+ $variationId = null;
+ if ($variation) {
+ $variationKey = $variation->getKey() ? $variation->getKey() : '';
+ $variationId = $variation->getId();
+ }
$experimentID = '';
$campaignID = '';
- if ($experiment->getId()) {
- $experimentID = $experiment->getId();
- $campaignID = $experiment->getLayerId();
+ if ($experiment) {
+ if ($experiment->getId()) {
+ $experimentID = $experiment->getId();
+ $campaignID = $experiment->getLayerId();
+ }
}
$impressionParams = [
DECISIONS => [
[
CAMPAIGN_ID => $campaignID,
EXPERIMENT_ID => $experimentID,
- VARIATION_ID => $variation->getId(),
+ VARIATION_ID => $variationId,
METADATA => [
FLAG_KEY => $flagKey,
RULE_KEY => $ruleKey,
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