[fix]meta evidence

package.json

@@ -1,6 +1,6 @@
 {
   "name": "kleros-api",
-  "version": "0.18.4",
+  "version": "0.18.6",
   "description": "A Javascript library that makes it easy to build relayers and other DApps that use the Kleros protocol.",
   "keywords": [
     "Blockchain",

src/contracts/implementations/arbitrable/Arbitrable.js

@@ -38,9 +38,10 @@ class Arbitrable extends ContractImplementation {
       { _metaEvidenceID: metaEvidenceID }
     )
 
-    if (!metaEvidenceLog[0]) return {} // NOTE better to throw errors for missing meta-evidence?
+    if (!metaEvidenceLog[metaEvidenceID]) return {} // NOTE better to throw errors for missing meta-evidence?
+
+    const metaEvidenceUri = metaEvidenceLog[metaEvidenceID].args._evidence
 
-    const metaEvidenceUri = metaEvidenceLog[0].args._evidence
     // FIXME caching issue need a query param to fetch from AWS
     const metaEvidenceResponse = await httpRequest('GET', metaEvidenceUri)