diff --git a/gradle.properties b/gradle.properties
index a7a2111e..04eece3a 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -30,8 +30,8 @@ pr_version = 4.19.0-beta+3
 ccl_version = 4.4.0.+
 cbm_version = 3.3.0.+
 network_lib_version = 1.0.3
-sedna_version = 1.0.62
-sedna_version_commit_ref = 5d8f6d6
+sedna_version = 1.0.61
+sedna_version_commit_ref = 68cb216
 
 # Debug Options
 debug_embeddium = false
diff --git a/src/main/java/li/cil/oc2/common/inet/StreamSessionImpl.java b/src/main/java/li/cil/oc2/common/inet/StreamSessionImpl.java
index a77acc84..1d9e01f5 100644
--- a/src/main/java/li/cil/oc2/common/inet/StreamSessionImpl.java
+++ b/src/main/java/li/cil/oc2/common/inet/StreamSessionImpl.java
@@ -101,7 +101,11 @@ public class StreamSessionImpl extends SessionBase implements StreamSession {
         state = switch (state) {
             case ESTABLISHED -> TcpStates.FINISH;
             case CONNECT -> TcpStates.REJECT;
-            default -> throw new IllegalStateException();
+            case FINISH, REJECT, EXPIRED -> state; // Already closing or closed
+            case ACCEPT -> {
+                LOGGER.warn("Closing session in ACCEPT state, forcing to REJECT");
+                yield TcpStates.REJECT;
+            }
         };
     }