diff --git a/CHANGELOG.md b/CHANGELOG.md
index f923ea16..c72218d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.3.11] - 2022-05-23
+## [0.3.13] - 2022-05-20
+### Fix
+- Fix wrong default value implementation for solver params.
+
+## [0.3.12] - 2022-05-20
 ### Improvement
 - Added support to provide solver name and path as parameters in the configuration file.
 
@@ -225,4 +229,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [0.2.14]: https://github.com/davidusb-geek/emhass/releases/tag/v0.2.14
 [0.3.0]: https://github.com/davidusb-geek/emhass/releases/tag/v0.3.0
 [0.3.6]: https://github.com/davidusb-geek/emhass/releases/tag/v0.3.6
-[0.3.8]: https://github.com/davidusb-geek/emhass/releases/tag/v0.3.8
\ No newline at end of file
+[0.3.8]: https://github.com/davidusb-geek/emhass/releases/tag/v0.3.8
+[0.3.13]: https://github.com/davidusb-geek/emhass/releases/tag/v0.3.13
\ No newline at end of file
diff --git a/config_emhass.yaml b/config_emhass.yaml
index 1feb36ec..fb435909 100644
--- a/config_emhass.yaml
+++ b/config_emhass.yaml
@@ -46,7 +46,7 @@ optim_conf:
   - prod_sell_price: 0.065 # power production selling price in €/kWh (only needed if prod_price_forecast_method='constant')
   - set_total_pv_sell: False # consider that all PV power is injected to the grid (self-consumption with total sell)
   - lp_solver: 'PULP_CBC_CMD' # set the name of the linear programming solver that will be used
-  - lp_solver_path: '/usr/bin/cbc' # set the path to the LP solver
+  - lp_solver_path: 'empty' # set the path to the LP solver
 
 plant_conf:
   - P_grid_max: 9000 # The maximum power that can be supplied by the utility grid in Watts
diff --git a/docs/conf.py b/docs/conf.py
index 82236b4e..7cce9578 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -22,7 +22,7 @@
 author = 'David HERNANDEZ'
 
 # The full version, including alpha/beta/rc tags
-release = '0.3.12'
+release = '0.3.13'
 
 # -- General configuration ---------------------------------------------------
 
diff --git a/docs/config.md b/docs/config.md
index acbb44b4..ddbba8f2 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -72,7 +72,7 @@ The following parameters and definitions are only needed if load_cost_forecast_m
 - prod_price_forecast_method: Define the method that will be used for PV power production price forecast. This is the price that is payed by the utility for energy injected to the grid. The options are 'constant' for a constant fixed value or 'csv' to load custom price forecast from a CSV file. The default CSV file path that will be used is '/data/data_prod_price_forecast.csv'.
 - prod_sell_price: The paid price for energy injected to the grid from excedent PV production in €/kWh. Defaults to 0.065. This parameter is only needed if prod_price_forecast_method='constant'.
 - lp_solver: Set the name of the linear programming solver that will be used. Defaults to 'PULP_CBC_CMD'.
-- lp_solver_path: Set the path to the LP solver. Defaults to '/usr/bin/cbc'.
+- lp_solver_path: Set the path to the LP solver. Defaults to 'empty.
 
 ## System configuration parameters
 
diff --git a/setup.py b/setup.py
index 62345021..7fc2f78e 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@
 
 setup(
     name='emhass',  # Required
-    version='0.3.12',  # Required
+    version='0.3.13',  # Required
     description='An Energy Management System for Home Assistant',  # Optional
     long_description=long_description,  # Optional
     long_description_content_type='text/markdown',  # Optional (see note above)
diff --git a/src/emhass/optimization.py b/src/emhass/optimization.py
index e66dee90..0e6a3016 100644
--- a/src/emhass/optimization.py
+++ b/src/emhass/optimization.py
@@ -81,8 +81,8 @@ def __init__(self, retrieve_hass_conf: dict, optim_conf: dict, plant_conf: dict,
         if 'lp_solver_path' in optim_conf.keys():
             self.lp_solver_path = optim_conf['lp_solver_path']
         else:
-            self.lp_solver_path = r'/usr/bin/cbc'
-        if self.lp_solver != 'COIN_CMD' and 'lp_solver_path' in optim_conf.keys():
+            self.lp_solver_path = 'empty'
+        if self.lp_solver != 'COIN_CMD' and self.lp_solver_path != 'empty':
             self.logger.error("Use COIN_CMD solver name if you want to set a path for the LP solver")
         
     def perform_optimization(self, data_opt: pd.DataFrame, P_PV: np.array, P_load: np.array,