diff --git a/.mergify.yml b/.mergify.yml
index 665ddc3de9..eb3ceeeef9 100644
--- a/.mergify.yml
+++ b/.mergify.yml
@@ -16,6 +16,21 @@ pull_request_rules:
         commit_message_template: |
           {{ title }} (#{{ number }})
           {{ body }}
+  - name: backport patches to main branch
+    conditions:
+      - label=backport/main
+    actions:
+      backport:
+        branches:
+          - main
+  - name: backport patches to v0.17.x branch
+    conditions:
+      - base=main
+      - label=backport/0.17.x
+    actions:
+      backport:
+        branches:
+          - release/v0.17.x
   - name: backport patches to v0.16.x branch
     conditions:
       - base=main
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a913cddb3..c419b3d046 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,12 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 # Changelog
 
+## Unreleased
+
+### Bug Fixes
+
+* (rpc) [\#1190](https://github.com/evmos/ethermint/issues/1190) Fix `UnmarshalJSON` panic of breaking EVM and fee market `Params`.
+
 ## [v0.17.1] - 2022-07-13
 
 ### Improvements
diff --git a/server/json_rpc.go b/server/json_rpc.go
index feefa12cb2..c27399b88c 100644
--- a/server/json_rpc.go
+++ b/server/json_rpc.go
@@ -61,11 +61,12 @@ func StartJSONRPC(ctx *server.Context, clientCtx client.Context, tmRPCAddr, tmEn
 	}
 
 	httpSrv := &http.Server{
-		Addr:         config.JSONRPC.Address,
-		Handler:      handlerWithCors.Handler(r),
-		ReadTimeout:  config.JSONRPC.HTTPTimeout,
-		WriteTimeout: config.JSONRPC.HTTPTimeout,
-		IdleTimeout:  config.JSONRPC.HTTPIdleTimeout,
+		Addr:              config.JSONRPC.Address,
+		Handler:           handlerWithCors.Handler(r),
+		ReadHeaderTimeout: config.JSONRPC.HTTPTimeout,
+		ReadTimeout:       config.JSONRPC.HTTPTimeout,
+		WriteTimeout:      config.JSONRPC.HTTPTimeout,
+		IdleTimeout:       config.JSONRPC.HTTPIdleTimeout,
 	}
 	httpSrvDone := make(chan struct{}, 1)
 
diff --git a/x/evm/keeper/params.go b/x/evm/keeper/params.go
index f9de24bfaf..c28198b489 100644
--- a/x/evm/keeper/params.go
+++ b/x/evm/keeper/params.go
@@ -8,7 +8,12 @@ import (
 
 // GetParams returns the total set of evm parameters.
 func (k Keeper) GetParams(ctx sdk.Context) (params types.Params) {
-	k.paramSpace.GetParamSet(ctx, &params)
+	// TODO: update once https://github.com/cosmos/cosmos-sdk/pull/12615 is merged
+	// and released
+	for _, pair := range params.ParamSetPairs() {
+		k.paramSpace.GetIfExists(ctx, pair.Key, pair.Value)
+	}
+
 	return params
 }
 
diff --git a/x/feemarket/keeper/params.go b/x/feemarket/keeper/params.go
index 1fb9e28f96..1583716c15 100644
--- a/x/feemarket/keeper/params.go
+++ b/x/feemarket/keeper/params.go
@@ -9,7 +9,11 @@ import (
 
 // GetParams returns the total set of fee market parameters.
 func (k Keeper) GetParams(ctx sdk.Context) (params types.Params) {
-	k.paramSpace.GetParamSet(ctx, &params)
+	// TODO: update once https://github.com/cosmos/cosmos-sdk/pull/12615 is merged
+	// and released
+	for _, pair := range params.ParamSetPairs() {
+		k.paramSpace.GetIfExists(ctx, pair.Key, pair.Value)
+	}
 	return params
 }