diff --git a/electrumx/lib/coins.py b/electrumx/lib/coins.py
index 1fedce8..a8b3167 100644
--- a/electrumx/lib/coins.py
+++ b/electrumx/lib/coins.py
@@ -47,8 +47,7 @@ import electrumx.lib.tx_dash as lib_tx_dash
 import electrumx.server.block_processor as block_proc
 import electrumx.server.daemon as daemon
 from electrumx.server.session import (ElectrumX, DashElectrumX,
-                                      SmartCashElectrumX, AuxPoWElectrumX,
-                                      BitcoinSegwitElectrumX)
+                                      SmartCashElectrumX, AuxPoWElectrumX)
 
 
 Block = namedtuple("Block", "raw header transactions")
@@ -85,6 +84,7 @@ class Coin(object):
     # Peer discovery
     PEER_DEFAULT_PORTS = {'t': '50001', 's': '50002'}
     PEERS = []
+    CRASH_CLIENT_VER = None
     BLACKLIST_URL = None
 
     @classmethod
@@ -399,11 +399,11 @@ class BitcoinCash(BitcoinMixin, Coin):
 class BitcoinSegwit(BitcoinMixin, Coin):
     NAME = "BitcoinSegwit"
     DESERIALIZER = lib_tx.DeserializerSegWit
-    SESSIONCLS = BitcoinSegwitElectrumX
     MEMPOOL_HISTOGRAM_REFRESH_SECS = 120
     TX_COUNT = 318337769
     TX_COUNT_HEIGHT = 524213
     TX_PER_BLOCK = 1400
+    CRASH_CLIENT_VER = (3, 2, 3)
     BLACKLIST_URL = 'https://electrum.org/blacklist.json'
     PEERS = [
         'btc.smsys.me s995',
@@ -612,7 +612,7 @@ class BitcoinSegwitTestnet(BitcoinTestnetMixin, Coin):
     '''Bitcoin Testnet for Core bitcoind >= 0.13.1.'''
     NAME = "BitcoinSegwit"
     DESERIALIZER = lib_tx.DeserializerSegWit
-    SESSIONCLS = BitcoinSegwitElectrumX
+    CRASH_CLIENT_VER = (3, 2, 3)
     PEERS = [
         'electrum.akinbo.org s t',
         'he36kyperp3kbuxu.onion s t',
diff --git a/electrumx/server/session.py b/electrumx/server/session.py
index d295692..f305da1 100644
--- a/electrumx/server/session.py
+++ b/electrumx/server/session.py
@@ -1078,7 +1078,9 @@ class ElectrumX(SessionBase):
         # that protocol version in unsupported.
         ptuple, client_min = util.protocol_version(
             protocol_version, self.PROTOCOL_MIN, self.PROTOCOL_MAX)
-        await self.maybe_attempt_to_crash_old_client(ptuple)
+
+        await self.crash_old_client(ptuple, self.env.coin.CRASH_CLIENT_VER)
+
         if ptuple is None:
             if client_min > self.PROTOCOL_MIN:
                 self.logger.info(f'client requested future protocol version '
@@ -1090,8 +1092,17 @@ class ElectrumX(SessionBase):
 
         return (electrumx.version, self.protocol_version_string())
 
-    async def maybe_attempt_to_crash_old_client(self, proto_ver):
-        return
+    async def crash_old_client(self, ptuple, crash_client_ver):
+        if crash_client_ver:
+            client_ver = util.protocol_tuple(self.client)
+            is_old_protocol = ptuple is None or ptuple <= (1, 2)
+            is_old_client = client_ver != (0,) and client_ver <= crash_client_ver
+            if is_old_protocol and is_old_client:
+                self.logger.info(f'attempting to crash old client with version {self.client}')
+                # this can crash electrum client 2.6 <= v < 3.1.2
+                await self.send_notification('blockchain.relayfee', ())
+                # this can crash electrum client (v < 2.8.2) UNION (3.0.0 <= v < 3.3.0)
+                await self.send_notification('blockchain.estimatefee', ())
 
     async def transaction_broadcast(self, raw_tx):
         '''Broadcast a raw transaction to the network.
@@ -1505,17 +1516,3 @@ class AuxPoWElectrumX(ElectrumX):
             height += 1
 
         return headers.hex()
-
-
-class BitcoinSegwitElectrumX(ElectrumX):
-
-    async def maybe_attempt_to_crash_old_client(self, proto_ver):
-        client_ver = util.protocol_tuple(self.client)
-        is_old_protocol = proto_ver is None or proto_ver <= (1, 2)
-        is_old_client = client_ver != (0,) and client_ver < (3, 2, 4)
-        if is_old_protocol and is_old_client:
-            self.logger.info(f'attempting to crash old client with version {self.client}')
-            # this can crash electrum client 2.6 <= v < 3.1.2
-            await self.send_notification('blockchain.relayfee', ())
-            # this can crash electrum client (v < 2.8.2) UNION (3.0.0 <= v < 3.3.0)
-            await self.send_notification('blockchain.estimatefee', ())