diff --git a/pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.kt b/pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.kt
index ca2159fc..071d8927 100644
--- a/pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.kt
+++ b/pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.kt
@@ -197,9 +197,13 @@ class OpenPgpMessageInputStream(
 
     private fun processOnePassSignature() {
         syntaxVerifier.next(InputSymbol.ONE_PASS_SIGNATURE)
-        val ops = packetInputStream!!.readOnePassSignature()
-        LOGGER.debug(
-            "One-Pass-Signature Packet by key ${ops.keyID.openPgpKeyId()} at depth ${layerMetadata.depth} encountered.")
+        val ops =
+            try {
+                packetInputStream!!.readOnePassSignature()
+            } catch (e: UnsupportedPacketVersionException) {
+                LOGGER.debug("Unsupported One-Pass-Signature packet version encountered.", e)
+                return
+            }
         signatures.addOnePassSignature(ops)
     }