diff --git a/CHANGELOG.md b/CHANGELOG.md
index d309bc7e..cdf48b59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 * Fix processing storage error for tuple-merger implementation of
   select/pairs (#271).
+* Do not change input tuple object in requests.
 
 ## [0.10.0] - 01-12-21
 
diff --git a/crud/insert.lua b/crud/insert.lua
index fbb0e462..1ad90665 100644
--- a/crud/insert.lua
+++ b/crud/insert.lua
@@ -43,7 +43,7 @@ end
 -- returns result, err, need_reload
 -- need_reload indicates if reloading schema could help
 -- see crud.common.schema.wrap_func_reload()
-local function call_insert_on_router(space_name, tuple, opts)
+local function call_insert_on_router(space_name, original_tuple, opts)
     dev_checks('string', 'table', {
         timeout = '?number',
         bucket_id = '?number|cdata',
@@ -58,6 +58,8 @@ local function call_insert_on_router(space_name, tuple, opts)
         return nil, InsertError:new("Space %q doesn't exist", space_name), true
     end
 
+    local tuple = table.deepcopy(original_tuple)
+
     local bucket_id, err = sharding.tuple_set_and_return_bucket_id(tuple, space, opts.bucket_id)
     if err ~= nil then
         return nil, InsertError:new("Failed to get bucket ID: %s", err), true
diff --git a/crud/replace.lua b/crud/replace.lua
index 2069398e..27e775d2 100644
--- a/crud/replace.lua
+++ b/crud/replace.lua
@@ -43,7 +43,7 @@ end
 -- returns result, err, need_reload
 -- need_reload indicates if reloading schema could help
 -- see crud.common.schema.wrap_func_reload()
-local function call_replace_on_router(space_name, tuple, opts)
+local function call_replace_on_router(space_name, original_tuple, opts)
     dev_checks('string', 'table', {
         timeout = '?number',
         bucket_id = '?number|cdata',
@@ -62,6 +62,8 @@ local function call_replace_on_router(space_name, tuple, opts)
         return nil, ReplaceError:new("Space %q doesn't exist", space_name), true
     end
 
+    local tuple = table.deepcopy(original_tuple)
+
     local bucket_id, err = sharding.tuple_set_and_return_bucket_id(tuple, space, opts.bucket_id)
     if err ~= nil then
         return nil, ReplaceError:new("Failed to get bucket ID: %s", err), true
diff --git a/crud/upsert.lua b/crud/upsert.lua
index 2ce3add9..58dec218 100644
--- a/crud/upsert.lua
+++ b/crud/upsert.lua
@@ -41,7 +41,7 @@ end
 -- returns result, err, need_reload
 -- need_reload indicates if reloading schema could help
 -- see crud.common.schema.wrap_func_reload()
-local function call_upsert_on_router(space_name, tuple, user_operations, opts)
+local function call_upsert_on_router(space_name, original_tuple, user_operations, opts)
     dev_checks('string', '?', 'table', {
         timeout = '?number',
         bucket_id = '?number|cdata',
@@ -69,6 +69,8 @@ local function call_upsert_on_router(space_name, tuple, user_operations, opts)
         end
     end
 
+    local tuple = table.deepcopy(original_tuple)
+
     local bucket_id, err = sharding.tuple_set_and_return_bucket_id(tuple, space, opts.bucket_id)
     if err ~= nil then
         return nil, UpsertError:new("Failed to get bucket ID: %s", err), true
diff --git a/test/integration/simple_operations_test.lua b/test/integration/simple_operations_test.lua
index 9ab7196d..a7be4200 100644
--- a/test/integration/simple_operations_test.lua
+++ b/test/integration/simple_operations_test.lua
@@ -1008,6 +1008,53 @@ pgroup.test_partial_result_bad_input = function(g)
     t.assert_str_contains(err.err, 'Space format doesn\'t contain field named "lastname"')
 end
 
+pgroup.test_tuple_not_damaged = function(g)
+    -- insert
+    local insert_tuple = {22, box.NULL, 'Elizabeth', 24}
+    local new_insert_tuple, err = g.cluster.main_server:eval([[
+        local crud = require('crud')
+
+        local insert_tuple = ...
+
+        local _, err = crud.insert('customers', insert_tuple)
+
+        return insert_tuple, err
+    ]], {insert_tuple})
+
+    t.assert_equals(err, nil)
+    t.assert_equals(new_insert_tuple, insert_tuple)
+
+    -- upsert
+    local upsert_tuple = {33, box.NULL, 'Peter', 35}
+    local new_upsert_tuple, err = g.cluster.main_server:eval([[
+        local crud = require('crud')
+
+        local upsert_tuple = ...
+
+        local _, err = crud.upsert('customers', upsert_tuple, {{'+', 'age', 1}})
+
+        return upsert_tuple, err
+    ]], {upsert_tuple})
+
+    t.assert_equals(err, nil)
+    t.assert_equals(new_upsert_tuple, upsert_tuple)
+
+    -- replace
+    local replace_tuple = {22, box.NULL, 'Elizabeth', 24}
+    local new_replace_tuple, err = g.cluster.main_server:eval([[
+        local crud = require('crud')
+
+        local replace_tuple = ...
+
+        local _, err = crud.replace('customers', replace_tuple)
+
+        return replace_tuple, err
+    ]], {replace_tuple})
+
+    t.assert_equals(err, nil)
+    t.assert_equals(new_replace_tuple, replace_tuple)
+end
+
 pgroup.test_opts_not_damaged = function(g)
     -- insert
     local insert_opts = {timeout = 1, bucket_id = 655, fields = {'name', 'age'}}