diff --git a/src/key.js b/src/key.js
index 90e8e92b..7e98f33b 100644
--- a/src/key.js
+++ b/src/key.js
@@ -490,11 +490,15 @@ Key.prototype.getExpirationTime = async function(capabilities, keyId, userId) {
   const sigExpiry = selfCert.getExpirationTime();
   let expiry = keyExpiry < sigExpiry ? keyExpiry : sigExpiry;
   if (capabilities === 'encrypt' || capabilities === 'encrypt_sign') {
-    const encryptExpiry = (await this.getEncryptionKey(keyId, null, userId)).getExpirationTime();
+    const encryptKey = await this.getEncryptionKey(keyId, null, userId);
+    if (!encryptKey) return null;
+    const encryptExpiry = encryptKey.getExpirationTime();
     if (encryptExpiry < expiry) expiry = encryptExpiry;
   }
   if (capabilities === 'sign' || capabilities === 'encrypt_sign') {
-    const signExpiry = (await this.getSigningKey(keyId, null, userId)).getExpirationTime();
+    const signKey = await this.getSigningKey(keyId, null, userId);
+    if (!signKey) return null;
+    const signExpiry = signKey.getExpirationTime();
     if (signExpiry < expiry) expiry = signExpiry;
   }
   return expiry;