diff --git a/NucleicRemote/NucleicRemote/Models/SessionCache.swift b/NucleicRemote/NucleicRemote/Models/SessionCache.swift
index 21b0b09..2b7b566 100644
--- a/NucleicRemote/NucleicRemote/Models/SessionCache.swift
+++ b/NucleicRemote/NucleicRemote/Models/SessionCache.swift
@@ -68,7 +68,7 @@ enum SessionCache {
         guard let root, let url = summariesURL, let dir = transcriptsDir else { return }
         try? FileManager.default.createDirectory(at: root, withIntermediateDirectories: true)
         let kept = Array(summaries.sorted { $0.updatedAt > $1.updatedAt }.prefix(sessionLimit))
-        if let data = try? encoder.encode(kept) { try? data.write(to: url, options: .atomic) }
+        if let data = try? JSONEncoder().encode(kept) { try? data.write(to: url, options: .atomic) }
         // Drop transcript files for sessions that fell out of the recent set.
         let keep = Set(kept.map(transcriptFileName))
         if let files = try? FileManager.default.contentsOfDirectory(